Fullblast

iTrader: (17)

99 TA M6 HCI

The Ls1 just got finished being rebuilt, being honed and new pistons with Hastings moly rings. They turned the crank and gave it King rod and main bearings.

I bought a set of 243 heads from an Ls2, and had them hand ported with a mill and a valve job.

It's also got a Texas Speed 228/232 112 Lsa cam kit, Fast 102 intake and FAst throttle body, 36# injectors, Air Lid and Long tube headers (which came on the car) to an off road Catless Y pipe to Borla

What kind of numbers do you guys think I should be expecting?

The same shop built a 99 Ta A4 with Ported 317 heads, full bolt ons and a 231/239 cam. He dynoed 395.

I'm hoping for 425 hp or so.

What do you guys think?

HCI2000SS

iTrader: (2)

Hard to say since dynos vary, but I think around 430-440 sounds reasonable

soloman369

iTrader: (13)

Well what kind of dyno do they have?

If dynojet i say maybe 410

Mustang dyno you won't break 400

Fullblast

iTrader: (17)

Has to be more than 410 with the 6 speed. I would think 420 would be minimum. They have a dynojet, and he told me I would get 30 hp over the auto. That would put me at 425

Jtm2085

iTrader: (1)

I made right at 440 with mildly cleaned up 243's,btr stage 4 cam, fast 92, t56, through a 9in and steel driveshaft. Loaded dynocom

SS69LS1

iTrader: (108)

I had a similar setup- 04 stock LS1 short block, same cam as you, T56, 4.10s, long tubes, and some cnc'd 241's, LS6 intake, ported stock TB, 85mm MAF. I dont know much about the heads other then they had bigger valves. It made 408 on dynojet.

Fullblast

iTrader: (17)

I just had it pulled on a dynojet. It made 407 rwhp.

I also added an under drive pulley. I was hoping it would make at least 420. They told me that I needed more like a 228/238 can with more exhaust to compensate for the y pipe. If I were to dual it out they said I would be at 415 or so.

How the hell are you guys getting these 420-440 dyno numbers?

soloman369

iTrader: (13)

I told you so......

Fullblast

iTrader: (17)

I knew you would say that!

Fullblast

iTrader: (17)

Can a Btr stage Iv with 235/242 duration really add another 20-30hp?

Do you have true duals or a y pipe?

96capricemgr

iTrader: (1)

Heads are more likely the key.

JosephIV

iTrader: (14)

On a Dynojet 224X my former 2001 Z28 made 433 RWHP and 403 RWTQ N/A on a tune setup for nitrous. The car made 505 RWHP on a wet 75 shot. Can't remember the TQ.

The combo was:

Stock bottom end LS1
TSP Torquer V2 cam - 232/234 -.600/.600 on a 112 LSA
Livernois Stage II 243's - decked for flatness, not milled down
Cometic .040" gaskets
YT 1.7 Roller Rockers
Comp Pushrods
Comp Lifters
LS6 Inake
Ported stock TB
SLP lid
K&N filter
QTP 1 3/4" Headers
TSP True Duals with bullets dumped
SLP flywheel
Powerbond Underdrive pulley
Centerforce Clutch
Stock 10 bolt with 3.42 gears

I'd be inclined to agree that there are a few HP to be had in a better set of heads. I wouldn't worry about it though. Run that thing and see what she does! If you really want to pick up some HP buy a wet plate nitrous kit. Best bang for the buck under a grand IMO.

Fullblast

iTrader: (17)

It sounds like I have a few Leaks on my headers where the collector tubes are rusted up. That's probably hurting my numbers too. Not to mention he said his dynojet reads low by 4 percent

I'm considering putting new headers on with true duals with an x pipe and a pair of flowmaster 1 chambers. I will also find a reputable tuner in my area this time to do the dyno.

Future mods will be another set of 243s and get them worked by one of the sponsors, and add a little bigger cam.

I'm gonna take it to the track this weekend and see what it runs.
Problem is, I have 275/40/17s with no traction if I punch it from a standstill. I have to get a rolling start or it Will burn out forever.

Jtm2085

iTrader: (1)

I'm sure the cam is worth some power but not 30hp worth. I had a tsp y pipe and gmmg catbAck when the car was dynoed. You have to remember that all dynos are different and that it is pretty worthless two use two different dynos to compare cars. You should run it down the track and compare your trap speeds to similar cars with similar DA

JIMS SVT

iTrader: (3)

Was it on the dyno with a regular radial or a Drag radial? Drag radials show less power on the dyno.

Fullblast

iTrader: (17)

It was on 245/40/17 Falken tires. Not drag radicals. He told me his machine was running 4 percent low and it's also really humid here.its still in the high 70s-low 80s here in Houston.

I'm going to the track next weekend to see what it traps.

Fullblast

iTrader: (17)

I read somewhere that rebuilt engines actually gain horsepower after they are broken in a bit after a few hundred miles. Is there any truth to this? Someone said in the neighbor hood of 20 horsepower

HCI2000SS

iTrader: (2)

I can tell from personal experience that this is very true. I have no dyno numbers to compare but based on several races with my buddy's ported/pullied 03 Cobra I'd say it was every bit of 20 hp

madmike9396

iTrader: (29)

Quit hunting numbers and run it. That will tell the whole story

Fullblast

iTrader: (17)

Haha! I wish I could. I tried to go to the track last night but they're closed for the holidays. Won't be open til after New year's. So all I can do is sit here and speculate.