xfi 292
Thread Starter
Staging Lane
Joined: Feb 2010
Posts: 73
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xfi 292 Hey guys Im running a xfi 292 in my 383 it has 11:1 ported stock heads and intake comp 1.6 rr longtubes ory cosra catback.My problem is Im not making the power I should be making. My car dynoed at 352 hp and 360 tq I thought I should be around 400 hp.
Thread Starter
Staging Lane
Joined: Feb 2010
Posts: 73
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The heads were ported when I got them from a friend his car made 390 with a cc306 and 10:5 comp. I have a brand new GM intake and a holley booster pump Feul pressure stays in the 42-44 area it has been tuned and iam running svo 30's
cam specs 292/300 242/248@50584/579 lift 113 lsa
cam specs 292/300 242/248@50584/579 lift 113 lsa
I have seen many people have a dyno sheet that says they should kill me, but neither my car or I are afraid of a sheet of paper other than the time slip when we compete.
Take it to the track
Thread Starter
Staging Lane
Joined: Feb 2010
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I took it to the track but I drove 100miles to get there so I didnt run it all out it went 13.04@107.95 with a 2.07 60 foot spinning throu 1st and 2nd gear on 555r's and I shifted @ 5800
M6 with 3:42's
M6 with 3:42's
if the race weight is 3650 it takes 328 rwhp to go 13.0
I suspect spinning in first and second cost you alot of HP, and shifting at 5800 is probably leaving some on table. Get some slicks and try again the setup is definately healthier than that time. I suspect you can get 12.2 which woud be he hp you expected.
First time at track is never good, and hopfully dyno got it safe. Trailer the car and let her riip
I suspect spinning in first and second cost you alot of HP, and shifting at 5800 is probably leaving some on table. Get some slicks and try again the setup is definately healthier than that time. I suspect you can get 12.2 which woud be he hp you expected.
First time at track is never good, and hopfully dyno got it safe. Trailer the car and let her riip
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Well, without even running the numbers, and even with you having more cubes, I'd guess that you don't have enough compression to be running that cam. This is a situation where the CC306 that you mentioned probably would be a much better choice.
I suggest looking into a custom ground XFI cam that has around the same advertised duration as the cc306.
I suggest looking into a custom ground XFI cam that has around the same advertised duration as the cc306.
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Staging Lane
Joined: Feb 2010
Posts: 73
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my pistons are 11:1 heads are decked some just dont know how much.
When I ran it.It had the fill interior plus 150lb speaker box and 2 amps,have removed speaker box amps and back seat and added a 6pt cage.Im hoping for low 12 on motor and low to mid 11's on gas.I also have 430 gears to go in.
When I ran it.It had the fill interior plus 150lb speaker box and 2 amps,have removed speaker box amps and back seat and added a 6pt cage.Im hoping for low 12 on motor and low to mid 11's on gas.I also have 430 gears to go in.
If a stroker f-body needs the juice to run 11s you screwed up in a big way.
You need to decide if you are going to "stay the course" with your failures or if you are going to try and do this right.
You need to decide if you are going to "stay the course" with your failures or if you are going to try and do this right.
Your mph suggested 12.5 or 370 rwhp so with slicks and holding RPM 12.2 is possible. What RPM did the dyno say was peak hp? Hold gear past peak hp few cams will give its all when short shifting. I would guess a 383 and that cam would peak >6200
I think the cam would take and even like more cr but 11:1 shouldn't cause that big of a drop since you are about 10% low on hp and a point cr if you are lucky might get you 20 hp.
I would try it with slicks and holding the gears more then see where you are at.
Good luck
I think the cam would take and even like more cr but 11:1 shouldn't cause that big of a drop since you are about 10% low on hp and a point cr if you are lucky might get you 20 hp.
I would try it with slicks and holding the gears more then see where you are at.
Good luck
Thread Starter
Staging Lane
Joined: Feb 2010
Posts: 73
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What are you talking thats y iam on here trying to find out what is wrong with my setup this is my first EFI build and its a daily driver.If you are going to be a *** I dont need to be on this forum.
Well I have to go clean garage. I am sure this will be a popular thread since every one here has cars that run fast everytime at the track and never have problems?
that cam you have like's 12.1 cr and 4:10 gears so that may help as well i have the xfi 280 and i have to shift at 6500 so i know that cam would like around 6600-6700 taking you dont let the rpms drop that low when you shift...
Thread Starter
Staging Lane
Joined: Feb 2010
Posts: 73
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My peak hp was @ 6000 and tq was @4500 I launched @ 2000 also and still blow the tires. Iam wondering if I should change my setup or work with what I got and fine tune it.The guy that tuned my car is a real dumb *** but I live in coastal NC and dont have many tuning options.I got a grand in tunning and I know its still not right.
I'm running 383 cid 12.3 static CR. I ran that cam thru a few dynamic CR calculators and came up with 9.1. Its the cam that I'm running. I like it but you need a good valve train to control it. I'll be swapping out valve springs soon and adjusting the shift points a bit higher. My tune is mail order and other than some timing and shift point changes its pretty much the same. If your CR is going to stay at 11.0 you might consider a different cam. FWIW.
Mec
Mec
My peak hp was @ 6000 and tq was @4500 I launched @ 2000 also and still blow the tires. Iam wondering if I should change my setup or work with what I got and fine tune it.The guy that tuned my car is a real dumb *** but I live in coastal NC and dont have many tuning options.I got a grand in tunning and I know its still not right.
Not what you want to hear but if that cam peaked at 6000rpms then either the valvetrain is really really bad or the heads are absolute garbage in order to choke it at so low an rpm.
It is widely recognized Comp's rpm ranges are WAY low because they use old school SBC rules from engines with long runners.
In an LT1 383 with good heads and a well spec'd cam say mid 330s will peak up around 6500 and make good power to 7000.
You know your car has problems, if you get bent out of shape when someone says that then the forum wont be able to help much.
My peak hp was @ 6000 and tq was @4500 I launched @ 2000 also and still blow the tires. Iam wondering if I should change my setup or work with what I got and fine tune it.The guy that tuned my car is a real dumb *** but I live in coastal NC and dont have many tuning options.I got a grand in tunning and I know its still not right.
Send the datamaster file to me I will help you get it right you can always put another cam in it, but do it after you at least try the cam agin at the track.
CR will improve ~2% a point, but you are >10% low there is more wrong than the cr. You should get more with less cam I agree, but is it worth the expense?
Reground cam $125, intake gaskets, water pump, messing with oil pan etc and in the end you will likely get ~400 RWHP and you can reach that with what you have now,
The heads are likely going to be your restriction so unless you are willing to almost start over stick with what you have. It's easy to spend someone else's money, but I don't like to spend money even when it is yours.
If you can send a datamaster file and tune I can see how bad your tune is. A second or third gear pull will do it.
Good luck
Not what you want to hear but if that cam peaked at 6000rpms then either the valvetrain is really really bad or the heads are absolute garbage in order to choke it at so low an rpm.
It is widely recognized Comp's rpm ranges are WAY low because they use old school SBC rules from engines with long runners.
In an LT1 383 with good heads and a well spec'd cam say mid 330s will peak up around 6500 and make good power to 7000.
You know your car has problems, if you get bent out of shape when someone says that then the forum wont be able to help much.
It is widely recognized Comp's rpm ranges are WAY low because they use old school SBC rules from engines with long runners.
In an LT1 383 with good heads and a well spec'd cam say mid 330s will peak up around 6500 and make good power to 7000.
You know your car has problems, if you get bent out of shape when someone says that then the forum wont be able to help much.
If fewer than one I agree get lost. You already told me you can't use a wrench so increase your post count somewhere else.
Thanks