Disappointed after modifications!
AGREED [happy now jerk 
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04-24-2009, 05:01 PM
#43
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yea its 100% the injectors man, they are probably at like 125% duty cycle over 6000rpms which is not good.
Throw some 36#'ers in there and it should jump the HP right up to around 380rwhp i'd say since you're running the shorties.
Maybe a tad higher if the port job was a decent one.
how much did he charge for the porting if you dont mind my asking?
you're in Saudi Arabi too arent you? Thats why the damn tracks 300 miles away!
Throw some 36#'ers in there and it should jump the HP right up to around 380rwhp i'd say since you're running the shorties.
Maybe a tad higher if the port job was a decent one.
how much did he charge for the porting if you dont mind my asking?
you're in Saudi Arabi too arent you? Thats why the damn tracks 300 miles away!
How did you know?
04-24-2009, 05:09 PM
#45
A cam that size probably needs to go beyond the pcm's capability in such a small engine.
The heads are a complete unknown.
The Hookers are not great, if the exhaust is single 3" that is not very good.
3.73s wont hurt the HP number but are a bad match to the M6 and a big cam.
There is no plan here, just collection of parts.
That said I have seen chassis dynos spit out some retardedly low numbers for cars that performed very well so take it too the track and see if the performance is in line with the dyno numbers.
The heads are a complete unknown.
The Hookers are not great, if the exhaust is single 3" that is not very good.
3.73s wont hurt the HP number but are a bad match to the M6 and a big cam.
There is no plan here, just collection of parts.
That said I have seen chassis dynos spit out some retardedly low numbers for cars that performed very well so take it too the track and see if the performance is in line with the dyno numbers.
Typical though, throw money at a motor and hope it makes power without doing any research.
04-24-2009, 05:12 PM
#46
1. Get a decent set of ported heads.
2. Get some injectors...you need fuel to make power.
3. That cam is too big for that motor. If you planned to spin higher maybe you could get by with it but still I think it's too big. Bigger is not always better.
4. I think there has to be a tuning issue. Unless the guy seriously mutilated the heads it should do at least as good as with stock heads. People running GM847's make 360'ish rwhp in an M6.
5. I had a car that dynoed way low too, turns out the tune was for a different cam and threw things all over the place.
6. You need longtubes, go long or go home.
Basically there is much more in this car. With a good tune, longtubes, a decent set of heads, and injectors this car should be making 400 rwhp easily and pulling hard to 6800. On a stock shortblock that's seriously in the redzone though.
Good luck.
2. Get some injectors...you need fuel to make power.
3. That cam is too big for that motor. If you planned to spin higher maybe you could get by with it but still I think it's too big. Bigger is not always better.
4. I think there has to be a tuning issue. Unless the guy seriously mutilated the heads it should do at least as good as with stock heads. People running GM847's make 360'ish rwhp in an M6.
5. I had a car that dynoed way low too, turns out the tune was for a different cam and threw things all over the place.
6. You need longtubes, go long or go home.
Basically there is much more in this car. With a good tune, longtubes, a decent set of heads, and injectors this car should be making 400 rwhp easily and pulling hard to 6800. On a stock shortblock that's seriously in the redzone though.
Good luck.
04-24-2009, 05:17 PM
#47
I don't think injectors are the problem just yet. Granted they should be too small but IMO it would make more power before they caused a problem.
Aeromotive regulator, wow this just keeps getting worse. You know those have BURNED CARS TO THE GROUND, single lease reliable regulator you can buy for an LT1. STOCK would have been fine.
Long as you have the adjustable regulator though you could use it to crank up the fuel pressure some IF and only IF you find the injectors are too small.
On another forum someone has a signature that goes something like "there are good parts and there are good engines, they are not the same thing", it really applies here.
You bought a bunch of stuff you thought was good and and threw it together with no plan or understanding of how it would work together or in this case NOT work.
Everyone is hating on the shorties and they were not a good choice but at the same time they are not a huge problem till well above this power, everyone hates mids too but mids are what my car runs 11.9s on. Those same guys who rip on mids will NOT say my car would be faster on longtubes. I think it will be but nothing earth shattering.
Aeromotive regulator, wow this just keeps getting worse. You know those have BURNED CARS TO THE GROUND, single lease reliable regulator you can buy for an LT1. STOCK would have been fine.
Long as you have the adjustable regulator though you could use it to crank up the fuel pressure some IF and only IF you find the injectors are too small.
On another forum someone has a signature that goes something like "there are good parts and there are good engines, they are not the same thing", it really applies here.
You bought a bunch of stuff you thought was good and and threw it together with no plan or understanding of how it would work together or in this case NOT work.
Everyone is hating on the shorties and they were not a good choice but at the same time they are not a huge problem till well above this power, everyone hates mids too but mids are what my car runs 11.9s on. Those same guys who rip on mids will NOT say my car would be faster on longtubes. I think it will be but nothing earth shattering.
04-24-2009, 05:19 PM
#48
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I did alot of search before attempting to modify my car & i chose whats best for my budget & hp goal.I know AI & LE combos are the best out there but for what i could pay i would expect less hp than their combos but not that low.
04-24-2009, 05:25 PM
#49
I don't think injectors are the problem just yet. Granted they should be too small but IMO it would make more power before they caused a problem.
Aeromotive regulator, wow this just keeps getting worse. You know those have BURNED CARS TO THE GROUND, single lease reliable regulator you can buy for an LT1. STOCK would have been fine.
Long as you have the adjustable regulator though you could use it to crank up the fuel pressure some IF and only IF you find the injectors are too small.
On another forum someone has a signature that goes something like "there are good parts and there are good engines, they are not the same thing", it really applies here.
You bought a bunch of stuff you thought was good and and threw it together with no plan or understanding of how it would work together or in this case NOT work.
Everyone is hating on the shorties and they were not a good choice but at the same time they are not a huge problem till well above this power, everyone hates mids too but mids are what my car runs 11.9s on. Those same guys who rip on mids will NOT say my car would be faster on longtubes. I think it will be but nothing earth shattering.
Aeromotive regulator, wow this just keeps getting worse. You know those have BURNED CARS TO THE GROUND, single lease reliable regulator you can buy for an LT1. STOCK would have been fine.
Long as you have the adjustable regulator though you could use it to crank up the fuel pressure some IF and only IF you find the injectors are too small.
On another forum someone has a signature that goes something like "there are good parts and there are good engines, they are not the same thing", it really applies here.
You bought a bunch of stuff you thought was good and and threw it together with no plan or understanding of how it would work together or in this case NOT work.
Everyone is hating on the shorties and they were not a good choice but at the same time they are not a huge problem till well above this power, everyone hates mids too but mids are what my car runs 11.9s on. Those same guys who rip on mids will NOT say my car would be faster on longtubes. I think it will be but nothing earth shattering.
04-24-2009, 05:27 PM
#50
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Just throwing this out there for you people trashing mid-lengths and blaming stock injectors.
My first go at a H/C setup was with a stock fuel pump and injectors... and wouldn't you know it... Random Tech Mid-Length headers.
She laid down 385 rwhp.
Stock injectors are not holding you back from all your lost power. You have larger issues than injectors and mid-lengths.
My first go at a H/C setup was with a stock fuel pump and injectors... and wouldn't you know it... Random Tech Mid-Length headers.
She laid down 385 rwhp.
Stock injectors are not holding you back from all your lost power. You have larger issues than injectors and mid-lengths.
04-24-2009, 05:33 PM
#51
Just throwing this out there for you people trashing mid-lengths and blaming stock injectors.
My first go at a H/C setup was with a stock fuel pump and injectors... and wouldn't you know it... Random Tech Mid-Length headers.
She laid down 385 rwhp.
Stock injectors are not holding you back from all your lost power. You have larger issues than injectors and mid-lengths.
My first go at a H/C setup was with a stock fuel pump and injectors... and wouldn't you know it... Random Tech Mid-Length headers.
She laid down 385 rwhp.
Stock injectors are not holding you back from all your lost power. You have larger issues than injectors and mid-lengths.
04-24-2009, 05:58 PM
#52
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Slapping on longtubes and bigger injectors will not fix the problem, it may slightly lessen the problem... but it will not be fixed.
Also... my Random tech mid's were horrible!!! 1-5/8", leaks everywhere! SLP shorty's would have made better numbers.
04-24-2009, 06:02 PM
#53
Not a 50hp difference... it's marginal at best (shorty's vs. Mid's).
Slapping on longtubes and bigger injectors will not fix the problem, it may slightly lessen the problem... but it will not be fixed.
Also... my Random tech mid's were horrible!!! 1-5/8", leaks everywhere! SLP shorty's would have made better numbers.
Slapping on longtubes and bigger injectors will not fix the problem, it may slightly lessen the problem... but it will not be fixed.
Also... my Random tech mid's were horrible!!! 1-5/8", leaks everywhere! SLP shorty's would have made better numbers.
04-24-2009, 06:06 PM
#54
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I agree completely... he left power on the table by choosing the shorty's over full length.
It's my opinion, that he has more pressing issues than headers going on here. His power numbers are pretty bad for what has been done... I suspect the heads are straight up soup sandwich.
04-24-2009, 06:08 PM
#55
I agree completely... he left power on the table by choosing the shorty's over full length.
It's my opinion, that he has more pressing issues than headers going on here. His power numbers are pretty bad for what has been done... I suspect the heads are straight up soup sandwich.
It's my opinion, that he has more pressing issues than headers going on here. His power numbers are pretty bad for what has been done... I suspect the heads are straight up soup sandwich.
04-24-2009, 08:09 PM
#56
There are guys who go with shorty headers and run the same numbers on the dyno and the same times at the track. They offer minimal gains at best. Mids are a minimum on a modded car like this one. Longtubes would be better. The injectors aren't causing you to lose tons of power but yes injectors are holding you back some now. I think the numbers were something like a 450 hp motor with 30lb injectors...the injectors are at like 98% duty cycle. So that being said you need at least 30lb injectors. 36's would be better though. Figure out the deal with the heads. And not to down you...but are you sure you have the tune right? You said you dynotuned it yourself? How much experience do you have tuning? Maybe that's part of the problem.
04-24-2009, 08:42 PM
#57
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even if shifting at 6800 RPM, the 350/355 better have LOTS of compression (12.0-12.5) to make that cam work even half way descent. Even still, a low/mid 230 duration is all you need for a 6800 RPM 355.
Lloyd
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