I dont get what is wrong...help?
#1
I dont get what is wrong...help?
I got my car dyno tuned today and ended up finishing what I thought to be way low from what I normally read and see in this section. The motor seems to run mechanically fine its just not putting down the power I thought it would. Mods are as follows:
6.0L iron block
30lb SVO injectors
Pacestter longtubes with offroad Y
Hooker Catback
Comp Cams XER 238/240 with .605/.609 lift on 112 lsa
Patriot Peformance Stage II LS6 heads with oversized valves
Fast 90/90
SLP MAF
SLP lid
The final result was 412 hp and 398 tq on a dynojet. This is an M6 car with a stock 10 bolt and 3.42 gears. It was 92 degrees out with approximently 30 percent humidity. I just though I would be closer to the 450 range with my setup. The car runs fine and has a 13-1 air fuel ratio for the entire curve. The torque curve is very flat. Just seems like everything should jump up by at least 30. I'm gonna try doing a compression test on each cylinder here shortly.
6.0L iron block
30lb SVO injectors
Pacestter longtubes with offroad Y
Hooker Catback
Comp Cams XER 238/240 with .605/.609 lift on 112 lsa
Patriot Peformance Stage II LS6 heads with oversized valves
Fast 90/90
SLP MAF
SLP lid
The final result was 412 hp and 398 tq on a dynojet. This is an M6 car with a stock 10 bolt and 3.42 gears. It was 92 degrees out with approximently 30 percent humidity. I just though I would be closer to the 450 range with my setup. The car runs fine and has a 13-1 air fuel ratio for the entire curve. The torque curve is very flat. Just seems like everything should jump up by at least 30. I'm gonna try doing a compression test on each cylinder here shortly.
#5
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something has to be wrong somewhere,there are 346 ci engines with cams that size pumping out around 460.hit the track and see what mph you lay down.maybe try a different dyno just to see if that is the problem. i know dynos are just a tuning tool but they do prove your engine is up to par .
#6
The engine is the stock short block. It had about 20k on it and the rest of the parts got slapped on it. The heads combustion chamber is 59cc I believe, so I should be somewhere around 11-1. The tuner called me today and told me he thought about it all weekend and wants to redo my car. He said he had to take a lot of fuel out and there were other things he could do instead of just taking fuel out. The car seems to run fine. I really was hoping for 450ish. The car seems to run a little rich still. Smoke out the pipes at idle. I think the idle could be adjusted some, but I dont see how that would have to do with WOT power. Anyone have a similar setup and tune their car with tunercats and could send me a file.
#7
I went back to the dyno today. Tried to go a little different route on the tune. Then my car sounded like it spun a rod bearing and all hope was lost. So I never tried to take the engine out of the car in my garage before, but I guess you gotta do what you gotta do. So is the car telling me to go forged or 408 who knows...
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#11
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What happened to all the previous 450rwhp patriot headed setups. Thats what made me decide to purchase an F-Body. Im talking before any other heads were avalible besides factory whittled castings . Remember the hype on the first AFR's before they were released ,yeah those were fun times. I read up and didnt even own a F-Body yet, but I was hooked. I dont understand the lower power numbers of today in general. The last post I remember on the commonly used Patriots was a disappointing number and all great numbered patriot setups vanished. Not knocking the comapany cause the prices were incredible for the powerlevels little 2 gs for heads and cam kit . I came from a 200rwhp 5.0 mustang so 450rwhp looked astonishing to me , hell still is. ....Their are so many options now for us that I get dizzy benchracing my future setup . Good Luck with your future build. Patriots have large Intake port cc's so get your DCR up as much as possible .
#13
Our intake runner volume is 227 +/- which is much smaller than other OEM ported 243 castings on the market. Most of which are 235 and larger. We add approx. 65-70 cfm of flow while only increasing runner volume by 15cc over stock. Our current program flows 302-305 with a 2.02" valve.
#15
I heard from a little birdy that this motor made 492 rwhp in a 97 c5 a few months ago with kooks 1.875 and open 3 inch y pipe and a different tuner. I think the patriot heads are going to be just fine.
#16
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Originally Posted by stockerta00
My motor had some issues so hopefully with a different tuner there is some good power to be made after the rebuilt since i broke 2 pistons
Last edited by edcmat-l1; 10-02-2006 at 04:29 PM.
#18
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Originally Posted by stockerta00
The engine is the stock short block. It had about 20k on it and the rest of the parts got slapped on it.
#19
Well my posts werent meant as an attack on you edcmat-l1. I never stated it was your fault or the tune. I just was trying to learn a little about it all. As for the cam specs, i dont remember if you told me you called comp and ran the numbers or not but that is what i was told was in the car. I was not trying to bring discredit upon your buisness or anything. I'm just pretty scepticle about getting the car tuned again. Ive been running a couple different threads on here to try and get some answers to some questions I had regarding tuning and about going with just forged pistons as opposed to forged pistons and rods. Never did i say anything to bad mouth you. So I hope we can all get along.
#20
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Originally Posted by stockerta00
Well my posts werent meant as an attack on you edcmat-l1. I never stated it was your fault or the tune. I just was trying to learn a little about it all. As for the cam specs, i dont remember if you told me you called comp and ran the numbers or not but that is what i was told was in the car. I was not trying to bring discredit upon your buisness or anything. I'm just pretty scepticle about getting the car tuned again. Ive been running a couple different threads on here to try and get some answers to some questions I had regarding tuning and about going with just forged pistons as opposed to forged pistons and rods. Never did i say anything to bad mouth you. So I hope we can all get along.
1: I showed you the part # in the comp cams MASTER CATALOG with all the specs. Should have been no question at that point.
2: You have continued to insinuate (typo?) that its a tune issue, stating that you want to have it tuned by someone else.
3: You changed the story a couple times as to what you knew about the motor.
4: I havent seen you take any responsibility for what happened to your motor. I hope the pictures are clear enuff for everyone to tell whats up.
As far as the rods are concerned, they're good for 500 HP with just rod bolts. You have ARP bolts in them now. Would H-beams be better? Of course, but you've said you where on a budget. BUT, if the piston to valve clearance isnt correct, it doesnt matter what you put in it, it'll live a short life. As far as tuning it, it wont leave my shop without being properly tuned. Afterwards you can take it to whoever you want. I dont lock my tunes, so anyone can look at it and tell you if I fucked up or not.