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340whp unlocked?

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Old 08-15-2012, 07:03 PM   #1
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Default 340whp unlocked?

I have slp lid, delphi maf, slp bellow, 80mm bbk tb, bbk ssi intake, 232/236 .579 112lsa, comp springs, slp long tubes slp ory, slp lm1, built 4l60 tci ssf 3600, moser 12 w/ 373s. I got my car dyno tuned the other day and had to drive an hour there and it was pretty hot but i ended up putting down 340whp and 315wtq unlocked. I was gonna have the tuner do a run locked but i was afraid the converter wouldnt take the abuse.That seems like very low numbers to be putting down for the mods ive done. what do you think? I know my 853s are hurting me but im in the process of looking for some ported 243s.
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Old 08-15-2012, 07:53 PM   #2
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Those are beyond low. I've seen cars with cam's ALOT smaller than that make more than that on a bad day. Who tuned the car if I may ask? Intake leaks? Exhaust leaks? Last time plugs and wires were replaced? Got a coil unplugged? I don't see pushrods on that list. Are you still running stock PRs?
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Old 08-15-2012, 08:13 PM   #3
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something is up with the dyno (reading very low) or the car is hurting.

i've watched bolt-on cars make higher numbers.

have you been to the track yet? what's it trap?
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Old 08-15-2012, 08:54 PM   #4
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when the car was hooked up the guy said it was running great. Im running stock pr's. I havent been to the track yet with this set up. It was hot but nothing crazy. I replace the wires and plugs about 2000 miles ago it was on a fresh oil change. The car runs good and no codes have popped up.Jaime over at hhp carolina in North Charleston tuned it. any ideas would could be wrong? Ive seen cars with less put out way more power too. when i had 273's 10 bolt, full intake and exhaust, stock suspension and a hurt trans i ran a 12.9 at 108 at atco raceway in NJ.
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Old 08-15-2012, 09:00 PM   #5
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Originally Posted by s346k View Post
something is up with the dyno (reading very low) or the car is hurting.

i've watched bolt-on cars make higher numbers.

have you been to the track yet? what's it trap?
My buddy about a month before me with his car similar setup except hes got a bigger cam and milled 243s and through an m6 he put down 392 when it was 100 out. South Carolina is very humid too. but **** i know i should be a lot higher than 340
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Old 08-15-2012, 09:24 PM   #6
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when the car was hooked up the guy said it was running great. Im running stock pr's. I havent been to the track yet with this set up. It was hot but nothing crazy. I replace the wires and plugs about 2000 miles ago it was on a fresh oil change. The car runs good and no codes have popped up.Jaime over at hhp carolina in North Charleston tuned it. any ideas would could be wrong? Ive seen cars with less put out way more power too. when i had 273's 10 bolt, full intake and exhaust, stock suspension and a hurt trans i ran a 12.9 at 108 at atco raceway in NJ.
Mistake #1: Stock pushrods with that aggressive of a camshaft and aftermarket springs.

Mistake #2: Not measuring pushrod length to get the proper preload. Are your heads stock?

Pull your pushrods and check to see if you have a bent one...then get some hardened ones.
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Old 08-15-2012, 09:29 PM   #7
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Mistake #1: Stock pushrods with that aggressive of a camshaft and aftermarket springs.

Mistake #2: Not measuring pushrod length to get the proper preload. Are your heads stock?

Pull your pushrods and check to see if you have a bent one...then get some hardened ones.
I do have stock heads. What size pushrods should i get? Thanks for the help. Could that be the problem? or just one of a few
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Old 08-15-2012, 09:40 PM   #8
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Aside from the stock pushrods, you are losing power through the Moser.
I have seen locked converters push numbers up anywhere from 5-40 rwhp.

So who knows. Take it back to the track. See what it traps.
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Old 08-15-2012, 09:43 PM   #9
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I do have stock heads. What size pushrods should i get? Thanks for the help. Could that be the problem? or just one of a few
If you didn't change the heads, I'd say get the stock length, which is 7.400. Some cams are cut on a smaller base circle IIRC, so you may need something slightly longer. Pushrods usually run ~100 a set, which is pretty reasonable. If you can, borrow a pushrod length checker, or hell, buy one, measure, and then order. There are many threads about how to check pushrod length. I think I have some bookmarked, I'll have to look again.

To see if you have a bent one, pull them out of the engine, one cylinder at a time, and try to roll them across a SOLID, SMOOTH, FLAT surface. If you have one that won't roll, then there's your culprit.
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Old 08-15-2012, 09:51 PM   #10
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Originally Posted by Mazzenger View Post
Aside from the stock pushrods, you are losing power through the Moser.
I have seen locked converters push numbers up anywhere from 5-40 rwhp.

So who knows. Take it back to the track. See what it traps.
I've seen a car lose ~20rwhp through an M9, but for him to only dyno @ 340rwhp, I feel thats a MAJOR discrepancy. I'd be PISSED if my Impala SS Dyno'd anything less than 380hp in it's current state, and my cam is WAYYY smaller than his. I definitely feel something isn't right, if the dyno was set up properly.
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Old 08-15-2012, 10:21 PM   #11
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Man I have almost a identical setup as your car, cam and all, 3500 stall, everything. And I only made 350hp 360 tq. I thought my numbers were low too.

I have 853's also but I just bought a set of 243's to put on.
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Old 08-15-2012, 10:25 PM   #12
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Thank you guys for the advice. Im gonna get on those harden pushrods, ive been wanting to do it for a little bit now. Ill let you know and if something is bent ill put up some pics. Im gonna bring it to the track and see how i do. The numbers are discouraging but if i some how pull a 1.60 60' i think i can pull a high 11 but then again i thought i wouldve been 380whp so well see how it goes either way i gotta get some drag radials and some harden pushrods.
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Old 08-15-2012, 10:29 PM   #13
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Originally Posted by white99ta!! View Post
Thank you guys for the advice. Im gonna get on those harden pushrods, ive been wanting to do it for a little bit now. Ill let you know and if something is bent ill put up some pics. Im gonna bring it to the track and see how i do. The numbers are discouraging but if i some how pull a 1.60 60' i think i can pull a high 11 but then again i thought i wouldve been 380whp so well see how it goes either way i gotta get some drag radials and some harden pushrods.
Yea, take it to the track, see what it runs. If it runs a good number, then its must be one HELL of a stingy dyno.
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Old 08-16-2012, 10:21 AM   #14
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I have an extra set of 7.400 hardened cromoly pushrods here. PM me for my number.
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Old 08-16-2012, 10:29 AM   #15
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I wouldnt worry. My old 98Z with factory LS1 intake (i know), stock heads, 230/236 cam and a good exhaust put down 348 unlocked. This was through a 10 bolt. It trapped 114-115 on a regular basis @ 3500 lbs.
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Old 08-16-2012, 10:50 AM   #16
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The last time I was on the dyno I had:

230/224 revers split cam
stock 853 heads
Fast 90/90
1 3/4 longtubes
3" duals, no crossover
25% underdrive pulley
Yank SS 3600
GM 12 bolt, 3.42 gears, upgrade axles and Eaton posi

Click the image to open in full size.

Unlocked autos on dynos are not going to make happy numbers. On a different day without the pulley it made 368rwhp but the trans grenaded after the driveshaft did this:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.



Car ran 7.78@90mph with a 1.78 60ft the next day in some serious heat/humidity (3000+ DA). Weighs somewhere over 3700#s. Ran 12.2@110mph with a 1.78 60ft on that setup before the spings went weak and ate the cam. Nothing stellar but for a heavy car I think it wasn't bad. IIRC the math indicated RWHP closer to 380+rwhp.
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Old 08-16-2012, 06:26 PM   #17
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Quote:
Originally Posted by thunderstruck507 View Post
The last time I was on the dyno I had:

230/224 revers split cam
stock 853 heads
Fast 90/90
1 3/4 longtubes
3" duals, no crossover
25% underdrive pulley
Yank SS 3600
GM 12 bolt, 3.42 gears, upgrade axles and Eaton posi

Click the image to open in full size.

Unlocked autos on dynos are not going to make happy numbers. On a different day without the pulley it made 368rwhp but the trans grenaded after the driveshaft did this:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.



Car ran 7.78@90mph with a 1.78 60ft the next day in some serious heat/humidity (3000+ DA). Weighs somewhere over 3700#s. Ran 12.2@110mph with a 1.78 60ft on that setup before the spings went weak and ate the cam. Nothing stellar but for a heavy car I think it wasn't bad. IIRC the math indicated RWHP closer to 380+rwhp.
Thats hell of a mess you have there. I am very disappointed in the numbers but im really only worried about the track. After i get some dr's im gonna go and ill post my numbers but im not sure when ill make it. Every track around here is very far away. Well far enough that i dont wanna drive my car then race and come back.
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Old 08-16-2012, 06:27 PM   #18
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I have an extra set of 7.400 hardened cromoly pushrods here. PM me for my number.
PM sent
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Old 08-17-2012, 08:50 AM   #19
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For what it's worth, I had an a4 99 trans am with bolt ons and unlocked ss3800 that only put down 303rwhp on a mustang dyno. But it ran 1.58 60' and 7.82 in the 1/8th. I wouldn't worry too much about it as long as it's tuned right.
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Old 08-17-2012, 11:15 AM   #20
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Ya I trust the guy that tuned it. These numbers were depressing but hopefully the numbers at the track make it rite. Haha
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