What's wrong?

[04Roush2]

Got my car back yesterday from installing the 5.0 Stroker on my car. The thing is the car only made 422 rwhp and I was expecting a lot more than that. Heck, my car dyno'ed 428 rwhp with the Procharger @ 10lbs (I still got the same pulley). Why did I loose 6 rwhp with a built motor?

Also, the car feels really sluggish at low RPM's. Most people have told me it's because the cam but I think it's wayyyy too sluggish. Any ideas on what might be going on?

[Graves]

Well that sucks.

(sorry i have no useful info for you, Carlos..)

[04Roush2]

Well, you're completely useless Dave. Might as well stick to photography



LOL JK

[86sleeper]

who built the motor?
How many miles have you put on it?
What heads?

I wouldn't think that you would gain too much if any with the stroker. tq curve might look better, but i don't see too many people with stellar gains out of a mod stroker.

[T5killa]

I'm curious also. I'll wait for the mod master himself (Jody) to chime in to hear what he has to say. I'm guessing the tune isn't 100% down yet.

[04Roush2]

Originally Posted by 86sleeper

who built the motor?
How many miles have you put on it?
What heads?

I wouldn't think that you would gain too much if any with the stroker. tq curve might look better, but i don't see too many people with stellar gains out of a mod stroker.

The motor was built by RMCR (Rocky Mountain Competition Research) Untitled Document

The engine only has around 2k miles and the heads are Patriot Stage 2 Heads P&P.

Originally Posted by T5killa

I'm curious also. I'll wait for the mod master himself (Jody) to chime in to hear what he has to say. I'm guessing the tune isn't 100% down yet.

I'm waiting to see what he says

[96greengt]

Originally Posted by 04Roush2

I'm waiting to see what he says

Ask and you shall receive...

1 stroker ftl
2 patriot heads ftl

3 what cams are in there??
looks like you only have a buck and a quarter more then me, still want me to get that 300 shot of juice for ya !! lmao

[96greengt]

Originally Posted by 04Roush2

The motor was built by RMCR (Rocky Mountain Competition Research) Untitled Document

Yet another problem, that link is a Chevy home page !!

[SCobraVT99]

so you put a built block in, and you are making less power?

[04Roush2]

Originally Posted by 96greengt

Ask and you shall receive...

1 stroker ftl
2 patriot heads ftl

3 what cams are in there??
looks like you only have a buck and a quarter more then me, still want me to get that 300 shot of juice for ya !! lmao

Yeah Yeah I would've gone with different heads if I was the one that bought the parts. The cams in there are VT Stage 3 Blower Cams.

Originally Posted by 96greengt

Yet another problem, that link is a Chevy home page !!

That's a shop here in the Springs. They specialize in T/A's, Camaro's, Mustangs, etc.

Originally Posted by SCobraVT99

so you put a built block in, and you are making less power?

pretty much

[tulabeast]

man i would pissed off

[04Roush2]

I am

[psiperformance]

Originally Posted by 04Roush2

Got my car back yesterday from installing the 5.0 Stroker on my car. The thing is the car only made 422 rwhp and I was expecting a lot more than that. Heck, my car dyno'ed 428 rwhp with the Procharger @ 10lbs (I still got the same pulley). Why did I loose 6 rwhp with a built motor?

Also, the car feels really sluggish at low RPM's. Most people have told me it's because the cam but I think it's wayyyy too sluggish. Any ideas on what might be going on?

LOWER COMPRESION and the fact that you have to let the motor break in break in alone could account for a 20 rwhp increase vs a totaly fresh motor.

also did you retune it ? tune could easily count for it you add biger casms bigger heads and dont tune you aren't likely to gain power.

also your boost should have droped alot with the breathing improvments you made down around 7 to 8 pounds at most and with the apropriate lower compression that means alot more ignition lead is possible.

i just finished a two valve for a customer from the valley stock cube short block lower compresion hand ported heads by kotzur our recomended cams and 8 psi from a non intercooled vortech and he made 460 rwhp at 5400 rpm wioth the 8 psi before he ran out of fuel I expect over 500 rwhp at red line arpound 11 psi when we can pull it all the way to 6200 after he comes back and does his fuel system.

[BigJnSA]

he bought the motor from a friend who had already put some miles on it, so i dont think its break in. im thinking tune as well.

[lasersnake96]

Are you making the same PSI on the new setup? What is the compresion on the new setup? Was the motor running fine when it ws in your friends car? What is the AF ratip compared to the old setup? Timing?

[YZF Voltage]

my bet would be on tune... also i bet ur boost is down with the new breathing.

[96greengt]

From the looks of your older thread when you got the engine, the biggest hol backs are the stock plenum, (t-body), looks like the stock intake still, and the shorty headers.
Slap some long tubes, aluminum intake (get one of my ported plenums) change the t-body and check the tune, I bet your numbers shoot up a good bit. What is the c/r on the new engine?

[86sleeper]

Did the boost drop?

[04Roush2]

Originally Posted by psiperformance

LOWER COMPRESION and the fact that you have to let the motor break in break in alone could account for a 20 rwhp increase vs a totaly fresh motor.

also did you retune it ? tune could easily count for it you add biger casms bigger heads and dont tune you aren't likely to gain power.

also your boost should have droped alot with the breathing improvments you made down around 7 to 8 pounds at most and with the apropriate lower compression that means alot more ignition lead is possible.

i just finished a two valve for a customer from the valley stock cube short block lower compresion hand ported heads by kotzur our recomended cams and 8 psi from a non intercooled vortech and he made 460 rwhp at 5400 rpm wioth the 8 psi before he ran out of fuel I expect over 500 rwhp at red line arpound 11 psi when we can pull it all the way to 6200 after he comes back and does his fuel system.

Originally Posted by BigJnSA

he bought the motor from a friend who had already put some miles on it, so i dont think its break in. im thinking tune as well.

Yeah, the motor is broke in already. I also did retune it with a custom tune.

Originally Posted by lasersnake96

Are you making the same PSI on the new setup? What is the compresion on the new setup? Was the motor running fine when it ws in your friends car? What is the AF ratip compared to the old setup? Timing?

The highest PSI we saw on the dyno was 10.6... I got a 10 psi pulley. A/F ratio is set around 11.4 so when I get to Texas it should be around 12.3 or so due to the change in altitude. I have no idea on where the timing or the compression in.

Originally Posted by YZF Voltage

my bet would be on tune... also i bet ur boost is down with the new breathing.

I also think it's on the tune.

Originally Posted by 96greengt

From the looks of your older thread when you got the engine, the biggest hol backs are the stock plenum, (t-body), looks like the stock intake still, and the shorty headers.
Slap some long tubes, aluminum intake (get one of my ported plenums) change the t-body and check the tune, I bet your numbers shoot up a good bit. What is the c/r on the new engine?

I got a 75mm TB w/ Plenum, Thypoon intake, etc.... Like I said, no idea on the compression ratio.


Are you available this weekend? Maybe I can bring you the car by so you can take a look.

[04Roush2]

Originally Posted by 86sleeper

Did the boost drop?

not according to the dyno