joshp14

iTrader: (5)

I had the car dyoed on a dynojet today. Last year with cam/headers it pulled 370 RWHP and 340 RWTQ. I recently added AFR 205 heads, running 11.4 CR with a .032 quench. See for yourself how the numbers came out below. The guy dynoing said that the tune was pretty darn close...it was a mail order tune from Jeff Creech. He also said it was pulling 26* timing. Let me know what you guys think of this and what problems there may be as to why they were so low.

-Josh

jophis37

iTrader: (1)

So all you added were heads right? I guess bumping the compression was good for pwr and tq over the curve. Maybe you should throw a cam in it.

joshp14

iTrader: (5)

No No, I added the heads on top of the cam/headers. Cam only was 370 RWHP...I only gained 10 HP with the heads??

WS6FirebirdTA00

iTrader: (33)

somethign is wrong, what pushrods did you use? full list of mods? honestly i dont trust the tune as i looked at two tunes today that looked like crap. i have an f13 and AFR heads and pulled 450/415 with a FAST, heavy ls7 clutch and full exhaust on 10:1 CR.

anyway you can send me a tuning file of it or no? i will tell you right now 26* of timing is not enough and cam only if you are a 6 speed, should have put down around 400 hp

WS6FirebirdTA00

iTrader: (33)

i went through your mods on your page, similar to mine. i woudl put in some TR6 plugs gapped at 0.045". you should be making 445-450 with an ls6 intake without a problem. might want to check on the recommended lifter preload for those lifters....what length PR's do you have? i will tell you right now you are going to want some 36# injectors for that thing too, if you are on stock you better upgrade quick cause you will run them over 100%

HOSS

iTrader: (12)

just looked at ur list of mods, if you have stock injectors, you are needing some new ones bad

joshp14

iTrader: (5)

7.325" pushrods - thread here - https://ls1tech.com/forums/generation-iii-internal-engine/484155-so-i-measured-pushrod-length-need-input.html

Full list of mods here: http://www.midwestfbodymeet.com/01tapics.html

I dont have the tune file cuz it was a mail order tune from Jeff Creech....the guy doing the dyno said it looked pretty close....so I dont know.

WS6FirebirdTA00

iTrader: (33)

a/f looked close but timing can make a world of difference. just have to start eliminating problems so you can get the power the car should make.

i would call the place you got the lifters from and find out preload information from the manufacturer and plunger depth

Doc

iTrader: (9)

So you mean that the dyno guy had your car on a scanner? HPT or EFI Live? Pretty darn close to what? The A/F ratio I take it? What 13.1 to 1 ? 26* of timing seems low. What was your timing / tune like before? Was this the same dyno as before? I wouldn't be so down until you get track times. You do have before times? How does the car feel? Sounds like it would not feel any different at all which would only further point to the tune.

fastmatt98

iTrader: (27)

Hmmm had C.A.M. do a mail order tune for you? Trust me spend the extra flow to get it done right. As the other guys said get some bigger injectors.

kumar75150

a little bit of timing does not make that much of a difference

sounds like something is wrong

WS6FirebirdTA00

iTrader: (33)

timing can make a huge difference but what makes me curious is the fact that he dynoed low cam only

Patrick G

iTrader: (14)

To me, it looks like your throttle body is not opening up all the way. Basically, you start showing the gains down low, then they go away. I know it sounds too easy to miss, but I've seen Stock Eliminator guys miss this before. Check the throttle cable and have someone step on the throttle and see if you're getting 100% throttle opening.

CHRISPY

What gas did you dyno with? Your AF is pretty lean for a dynojet too...

WS6FirebirdTA00

iTrader: (33)

thats a good point

joshp14

iTrader: (5)

Ok to answer all the questions...I do have stock injectors...I read on LS1tech that these would work up to 450 RWHP. Do you think that this problem could be injector or fuel related?

The lifter plunger depth on the lifters is suppose to be the same as stock...Lunati said a .030-.040 preload. Given the pushrods available, I chose a .050 preload over a .025 preload by going with the 7.325" pushrods.

I dont think he had a editing program hooked up while on the dyno, I believe it was a Snap-on scanner where you can monitor engine parameters. I dont know how the guy dynoing based his judgement that the tune was "pretty close"...I guess he may have been going off of timing and A/F ratio.

The first time it was on the dyno it was a Mustang Dyno where the numbers were converted to dynojet numbers...so I never really had a true dynojet number. Stock numbers on Mustang dyno was 301 RWHP. Cam/Headers was 368 RWHP on same dyno and now on this dynojet its 380. Track times BEFORE heads with cam/headers only was a best of 12.5@115 with 2.xx 60' times on street tires. The tune we had on the car before the heads was done by a friend using EFI Live and his basic knowledge.

The car doesnt feel a whole lot different after the heads, there is some more in the low end, but then again I did 4.10 gears at the same time as the heads. Cant really notice much difference mid to upper RPM. Havent been to the track yet...heads dont even have 1000 miles on them yet.

I am using the TR55 plugs at the stock gap. Should I narrow this up a little running higher compression?

Patrick, would I check this by just looking into the throttle body while someone is on the pedal? Or would I use a scan tool to monitor the TPS voltage or % open? The only thing we have done to the throttle body is bascially hand sand it to smooth and polished it with some polish.

It has always used ONLY BP/Amoco 92 octane fuel as I cant find anything higher around here except the 93 at Wal-Mart which I refuse to buy (I hate Wal-Mart).

Doc

iTrader: (9)

Scan it with EFI Live for the TP. I would seriously reconsider the grudge on Walmart my friend if they are your only source of 93. I just came back from Bahrain- land of oil in the heart of the middle east they only have 89 You don't hate Walmart because you are a serious tree huggin, Kerry votn', Honda drivn', dirty hippie peacenick? I mean Iv'e never known one to drive a muscle car...

joshp14

iTrader: (5)

You think I will notice that much of a difference between 92 and 93? No I dont go to walmart cuz its a redneckin', fiesta drivn', mexican workin', nasty place to go. Plus you have to walk 10 miles anywhere in the store to get something.

JakeFusion

iTrader: (7)

Unfortunately, Wal-Mart or Sam's Club always has the best prices on gas

Around here anyway.

Abdullah

iTrader: (2)

maybe the pushrods are off, you have to get the stock length 7.400", just an idea to check.