Hey V8slr...PM me your name and address...you own a diary! 
R
355 HP For LH Guestimate?
Started by
_rorym_
, Jan 07 2008 11:27 PM
137 replies to this topic
#76
_rorym_
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Posted 15 January 2008 - 08:26 PM
Yeah will do the ends of the extractors...only cause you guys say to! Lol!...Guess you all do know something... Hey V8slr...PM me your name and address...you own a diary!
R
Hey V8slr...PM me your name and address...you own a diary! R
#77
_rorym_
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Posted 15 January 2008 - 08:30 PM
Greg, The A/F ratio sat on 13.4 @4600rpm up to 14.0 at 5000rpm then back down to 13.3 @5800rpm and held that to the end....didnt do any other pipes..but reckon the mods will deliver more as you say...oil sat on 56 flat the whole time..give or take a point..BMEP was on the screen but I didnt grab a copy...will get that tomorrow..Good on ya mate.. It is always nice to pull the cord on a new one!
How were her vitals? (oil,water,) Did you get a BMEP read out on it?
Did you get to try it with a bigger set of pipes?
If you cut off those horrible collectors and fatten things up a bit you won't lose anything in the mid range and it should find about another 30Hp @ the top as a bonus you will probably get another 500rpm as well..... Good thing rpm in a track engine ,it gives you a bit more flexibility with gearing options..
Cheers Greg..
R
P.s. ..28 degrees and 75% humidity which probably didnt help as well.
Edited by rorym, 15 January 2008 - 08:39 PM.
#78
_ezy_09s_
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Posted 15 January 2008 - 08:48 PM
Are you going to play with the combo anymore??..because i think you could find another 30 or so ,even your torque seems a bit low for a 355.
I would make a few suggestions but most people dont tend to listen anyway..until their combo doesnt make the power,then all the excuses under the sun come out.
If your happy with the power all well and good i guess,but i personally think as Greg also said it should have around 30 more with a stronger torque curve & bring rpm up a bit.
A 355 engine should make more torque than what you have at the moment .
Can you post up your dyno run so i can see your brake specifics & volumetric efficiency? as well as hp/ft lb curve.
I would make a few suggestions but most people dont tend to listen anyway..until their combo doesnt make the power,then all the excuses under the sun come out.
If your happy with the power all well and good i guess,but i personally think as Greg also said it should have around 30 more with a stronger torque curve & bring rpm up a bit.
A 355 engine should make more torque than what you have at the moment .
Can you post up your dyno run so i can see your brake specifics & volumetric efficiency? as well as hp/ft lb curve.
#79
_moot_
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Posted 15 January 2008 - 09:07 PM
i dont think you'll get it to make power higher than the 6500rpm as thats where my mates makes max power with biger pipes than yours and a single plane. but yeah,you should be able to find more torque. the above motor made 470ftlb. but it has 6" rods and very mild heads
#80
_rorym_
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Posted 15 January 2008 - 09:43 PM
Thanks Gaz,
Ezy,
We will mod the pipes then see what happens...according to several other websites the torque is on par with genuine dynos for a 355 with dual plane and Tri Y pipes.....the thing I am more than happy with is the flat torque line...I am not chasing top end horsepower...its not a drag race engine...its a sprint car engine...(which a lot of people forget...1/4 mile doesnt interest me)..the deal is to have midrange grunt to get from one corner to the next like its been fired out of a 50mm cannon....at 1200kgs...I am more than confident I will be at the next corner b4 I even know I am there....which is the whole exercise.I think for the moment we will try it in the car...I can get used to it then chase more if I need it..but I am pretty sure in a hillclimb situation...it will suffice for me for the time being.
R
Ezy,
We will mod the pipes then see what happens...according to several other websites the torque is on par with genuine dynos for a 355 with dual plane and Tri Y pipes.....the thing I am more than happy with is the flat torque line...I am not chasing top end horsepower...its not a drag race engine...its a sprint car engine...(which a lot of people forget...1/4 mile doesnt interest me)..the deal is to have midrange grunt to get from one corner to the next like its been fired out of a 50mm cannon....at 1200kgs...I am more than confident I will be at the next corner b4 I even know I am there....which is the whole exercise.I think for the moment we will try it in the car...I can get used to it then chase more if I need it..but I am pretty sure in a hillclimb situation...it will suffice for me for the time being.
R
Edited by rorym, 15 January 2008 - 09:47 PM.
#81
_Herne_
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Posted 15 January 2008 - 09:46 PM
Nice one Rory, good to see decent figures and know you have more up your sleeve 
Cheers
Herne
Cheers
Herne
#82
_@milco@_
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Posted 15 January 2008 - 11:32 PM
good work mate, great combo you got there,
#83
_ezy_09s_
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Posted 16 January 2008 - 02:10 AM
Gday Rory,dont think all drag racers only chase top end horsepower as it's torque that accelerates the car..believe me just because we aim for high figures doesnt mean we'll settle for a shit torque curve..when you let go of the transbrake at 5000 rpm you want that car to be accelaterated as hard as possible ,NOT falling flat on its face as soon as you leave the line.
I dont know why so many people are misguided into thinking any drag engine will have NO torque...any decent engine builder is going to build their combination with as much horsepower and the best torque curve achievable.
You say "im not interested in drag racing" fair enough,you want strong mid range torque!
Well my old chev 380(only 25 cubes bigger than yours)had over 500 ft/lbs from 4500..peaked at 560 ft/lbs and still had 495 at 7000 rpm...flat as a pancake.
Not bad for a "drag" engine.
You can whack that in your torana and tell me how its goes at hillclimbs if you like.
Look i just want to try and help you find a bit more in your combo( if its already on a dyno,you might as well try some things in the quest for a better engine).
Here are some good tri y pipes..if you can copy this,if not i would try just the 3" straight collector..but i believe the merge collector to be of benefit for your application
Have you played with timing/valve lash/4 hole or open carb spacers etc.. or is it pretty much just had a couple of power runs and thats it.
I am obsessed with finding every last drop of power from any given combination..& believe you have more in yours.
I dont know why so many people are misguided into thinking any drag engine will have NO torque...any decent engine builder is going to build their combination with as much horsepower and the best torque curve achievable.
You say "im not interested in drag racing" fair enough,you want strong mid range torque!
Well my old chev 380(only 25 cubes bigger than yours)had over 500 ft/lbs from 4500..peaked at 560 ft/lbs and still had 495 at 7000 rpm...flat as a pancake.
Not bad for a "drag" engine.
You can whack that in your torana and tell me how its goes at hillclimbs if you like.
Look i just want to try and help you find a bit more in your combo( if its already on a dyno,you might as well try some things in the quest for a better engine).
Here are some good tri y pipes..if you can copy this,if not i would try just the 3" straight collector..but i believe the merge collector to be of benefit for your application
Have you played with timing/valve lash/4 hole or open carb spacers etc.. or is it pretty much just had a couple of power runs and thats it.
I am obsessed with finding every last drop of power from any given combination..& believe you have more in yours.
#84
_ezy_09s_
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Posted 16 January 2008 - 02:48 AM
Btw..try dynoing either late at night or nice and early in the morning,28 degrees & 75% humidity wont help even though the dyno will correct.
Those pipes if your wondering what they are off are from a sb2 headed chevy nextel nascar..but many circuit/trans am/etc use tri y's like these.
Those pipes if your wondering what they are off are from a sb2 headed chevy nextel nascar..but many circuit/trans am/etc use tri y's like these.
#85
GML-31
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Posted 16 January 2008 - 06:53 AM
to be honest Rory I would rather have a motor that works from 3500-5500 than rev the guts out of it... some good pipes and you will be happy.
#86
_rocket_
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Posted 16 January 2008 - 07:39 AM
Looks like you wont be that far infront of me now, well on the same lap anyway !
#87
_Lostit_
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Posted 16 January 2008 - 01:19 PM
Good numbersmate grats:)
Be interesting what it runs down the strip .
Be interesting what it runs down the strip .
#88
_rorym_
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Posted 16 January 2008 - 01:27 PM
Ezy,Here are some good tri y pipes..if you can copy this,if not i would try just the 3" straight collector..but i believe the merge collector to be of benefit for your application
....They were 4 into 1s when I went to school..??
We are doing the collector pretty much as your pic shows...
It all hinges on where do you stop??..I can spend $2000 on a set of handmade/bent 4 into 1 s for more gains as well but you have to draw the line in the sand somewhere....at the moment it is under stressed...strong and will last for ages......the wear and tear of repeated dyno runs for a minimum amount of gain doesnt really interest me....However you might on your engine, spend days getting it just right...I am ok with that as well......
I will bung on the new pipes with collector and see where it sits then.
R
#89
MRLXSS
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Posted 16 January 2008 - 01:38 PM
Do you have a print out of the torque line you could scan and put up for us? I'd like to see how the torque curve compares to my baby 290 stroker
#90
TerrA LX
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Posted 16 January 2008 - 01:41 PM
The first pic that ezy 09's posted definatly looks like try Y to me.
#91
ls2lxhatch
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Posted 16 January 2008 - 01:42 PM
If you look closely you will see that the extractors are tri y. The collectors are 4 into 1.
The biggest problem is that as far as extractors go there is bugger all room to work with in the LX.
The biggest problem is that as far as extractors go there is bugger all room to work with in the LX.
#92
_rorym_
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Posted 16 January 2008 - 04:16 PM
Correct.The biggest problem is that as far as extractors go there is bugger all room to work with in the LX.
R
#93
_rorym_
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Posted 16 January 2008 - 04:25 PM
Now I might be getting old but years ago..these were Tri - ys...
and these were 4 into 1s....I see that Ezys collector breaks into 2 but they are 4 into 1s to me. The 4 pipes look the same length into a 4 unit collector.I cant see where his has 2 pipes joining into 1 b4 they get to the collector...which...I am told by exhaust experts..is the principle of Tri Y...or we are all mislead...? Maybe some people call them different things..??
R
Theseare Pacemakers off the Best Mufflers website. website
Tri-Ys
Tuned 4 into 1
and these were 4 into 1s....I see that Ezys collector breaks into 2 but they are 4 into 1s to me. The 4 pipes look the same length into a 4 unit collector.I cant see where his has 2 pipes joining into 1 b4 they get to the collector...which...I am told by exhaust experts..is the principle of Tri Y...or we are all mislead...? Maybe some people call them different things..??
R
Theseare Pacemakers off the Best Mufflers website. website
Tri-Ys
Tuned 4 into 1
Edited by rorym, 16 January 2008 - 04:39 PM.
#94
_rorym_
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Posted 16 January 2008 - 04:41 PM
I will get it up tomorrow for you MRLX.Do you have a print out of the torque line you could scan and put up for us? I'd like to see how the torque curve compares to my baby 290 stroker
R
#95
ls2lxhatch
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Posted 16 January 2008 - 05:43 PM
They look like tri-y to me, just longer primaries and shorter secondaries than you typically see. What is confusing the issue is the picture of the 4-1 collectors posted below the picture of the extractors which makes it look like one picture.
Edited by ls2lxhatch, 16 January 2008 - 05:46 PM.
#96
_ezy_09s_
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Posted 16 January 2008 - 05:54 PM
Yes thats right ls2lxhatch,they are tri y pipes in the first picture..just making the comparison between an off the shelf tri y pipe & a good set of custom pipes which are made to be the best possible for the engine..not just made to fit whatever or to be cheap.And the other picture shows a pair of 4 into 1 collectors( one a merged collector the other straight)
And yes the primary pipes are longer for a reason..i guess they do look like 4 into 1's when you dont look at them properly.
But these are proper tri y pipes..some pro stock racers have even gone back to using a tri y...now why would nascar/circuit/trans am or pro stock go back to using an optimum designed set of tri y's...Mmm
Cause a properly designed set are better.
And you can get a good size pipe into an Lx..Want to see some 2 1/4" primary pipes on a 632 big block in an lx?
#97
racean69
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Posted 16 January 2008 - 06:21 PM
^^ Yes
#98
ls2lxhatch
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Posted 16 January 2008 - 06:32 PM
Yes please.And you can get a good size pipe into an Lx..Want to see some 2 1/4" primary pipes on a 632 big block in an lx?
I thought that the 4-1 on the www.bestmufflers.com were interesting.
Edited by ls2lxhatch, 16 January 2008 - 06:33 PM.
#99
_rorym_
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Posted 16 January 2008 - 06:43 PM
Shit I like that tow hook on the front subframe!..Never though of that!
OK..it appears everything is up for interpretation..
Back to my original statement..if I wanted..I could spend $5000 on a set of pipes....
I dont want to....
the numbers..for me..are OK for my purpose.
I was shown a 383 Holden that ran 580 ft/lbs of torque on the same dyno...not relevant to me..oranges and apples..
R
Jump in Moot anytime...?
OK..it appears everything is up for interpretation..
Back to my original statement..if I wanted..I could spend $5000 on a set of pipes....
I dont want to....
the numbers..for me..are OK for my purpose.
I was shown a 383 Holden that ran 580 ft/lbs of torque on the same dyno...not relevant to me..oranges and apples..
R
Jump in Moot anytime...?
Edited by rorym, 16 January 2008 - 06:49 PM.
#100
_ezy_09s_
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Posted 16 January 2008 - 07:22 PM
1.The bottom line is you could make your pipes better by doing a simple mod
2.I was only making suggestions that would benefit you not me
3. You were the one that claimed before that you cant see why your engine shouldnt be able to make 500 ft/lbs..now its got 400.
4.Why is comparing another holden engine that you say has 580 ft/lbs..comparing apples & oranges??...because its 28 cubes bigger
Torque was your main goal if im correct..and it seems to be lacking that.
2.I was only making suggestions that would benefit you not me
3. You were the one that claimed before that you cant see why your engine shouldnt be able to make 500 ft/lbs..now its got 400.
4.Why is comparing another holden engine that you say has 580 ft/lbs..comparing apples & oranges??...because its 28 cubes bigger
Torque was your main goal if im correct..and it seems to be lacking that.
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