HardcoreABN

$1500 for 30hp still ****** imo, unless it is a max effort race engine.

0Tony Mamo @ AFR

Sure....I can get you a billet 102 throttle by wire unit....just know its a bitch to tune an ETC 102 TB. You need a really good tuner that is familiar with those particular TB's.....its much easier to tune a 102 FBody cable style TB because they have the IAC motor which helps alot. It is worth about 5 RWHP but a ported GM unit narrows the gap and is much easier to tune.

Speak to your tuner and make sure he is comfy with the ETC 102 before taking the plunge

-Tony

tblu92

Tony ---- Just curious about your thoughts on his AFR--Isn't 13.0 somewhat LEAN for a daily driver ?? Also we don't know what the WOT timing is---

chaase

WICKEDFRC's are the numbers I would expect to see from a 402 with a good sized cam. I am running a stock displacement head/cam car and I am 419rwhp/390rwtq. My cam is nowhere near that size and it is the stock ls6 intake and throttle body.

Even with an LS2 Intake I would expect to see high 400s

0Tony Mamo @ AFR

Nope....

EFI LS engines like to be a little leaner at max power.....most of my combinations make the best torque around 12.5 - 12.7.....the most power around 12.9 - 13.2....and leaner yet past peak power approaching your shift point (max RPM).

I dont shoot for a table top at some given A/F ratio.....I move the A/F some thru out the RPM band to optimize the entire curve.

Regarding timing I just have to assume its correct.....usually around 26-28' is what most of these combinations seem to like.

A FAST 102 (ported) on the OP's combo is just a no brainer.....between that and potentially locking the converter and a little more tweaking on the tune it might surprise you whats still lurking there. Also, we dont know if this particular dyno is perhaps very stingy.....another variable that comes into play.

-Tony

C5Natie

riggs 74

Thanks guys for all your help and suggestions. I am going to visit a few shops today and talk with each tuner get a feel for which one I feel is best to help tune my setup. I hope to get the car tuned within the next few weeks.

Terry.

riggs 74

Update on my 402 LS2 with the LS2 LSXR ported 102 intake.

Saturday morning all loaded up and ready to go for a tune.




Dyno results from About two years ago with the LS2 intake with a 90 elbo to mass air sensor, then a large cone KN filter.
415 HP 402 TQ



ABout two months ago I had the car tuned again, this time with a spectre brand 4" cold air intake I pieced together and a 5" inclosed spectre brand filter, ran to the front of the car to try and grab some cold air, hoping to make better HP. Wrong, I lost 20 HP with that set up over the last tune with the 90 elbo and large 9" cone KN air filter.
While trying to tune the car on that vist, we ran the car with out the cold air intake but with the spectre inclosed 5" filter and was still down 10 HP from the very first tune, shaking my head and with my original cold air intake with the 90 and KN filter, we made one more pull without any cold air intake or filter, just the mass air flow sensor and made 423 HP 418 TQ. At this time we decided that the LS2 intake was also holding back the car based on the readings from the map sensor. This is when I decided to take the plunge and by the ported LSXR Fast intake.




Today's tune, a ported LSXR FAST 102 intake, stock 90 mm throttle body, a 4" 90 elbow, mass air sensor at the end of the 90 and a 9" large cone KN filter.

The results, 447 HP and 430 TQ




The way I see it, the ported LSXR Fast intake netted me about 30 HP and tq over the stock LS 2 intake. The first dyno numbers with the K&N filter was 415 HP 402 TQ , and now with the FAST LSXR intake and back to the K&N filter setup. I can't say what the weather conditions were for each dyno run but the first one was done in late summer weather, humid and today's dyno run was also done in humid weather, both sessions with about the same temps at around mid 80's.

Over all the FAST LSXR 102 intake allowed the motor to breathe finally. How ever I wish I was running a Manuel trans instead of the 4L70E auto, I'm sure there is a loss of power there that would have been great to have at the wheels. No matter, the car is a blast to drive.




Engine specs,

LS2 6.0 block

Callies 4'' forged crank
Callies 6.125 forged rods
Wiseco 4.005 pistons

Trick flow 225 cnc ported 65cc heads

Trick Flow cam @ .50in 238/242 lift .595/.595

FAST LSXR 102 intake with 90mm throttle body and 46# FAST fuel injectors.

4'' 90 elbow, 4'' mass air sensor and 9.5'' K&N cone air filter.

1 7/8'' long tube headers 2.5'' exhaust

4L70E trans with 3200 stall and 390 gear in diff.
285/40/18 rear tire

Terry

Chicago1

They don't seem to make a a difference and seem like they are a pain to install also for what you get

Gray Ghost GS

I recommend calling Ed Hutchings of Hi-Tech Tuning for a mail order tune based on your list of mods. I have the ported FAST 92 on my LS2 with headers, cams, etc. and its making almost 50 more horsepower and torque than your setup, which tells me something may be wrong with your tune.

Anthraxmm

Mail order tune is probably a bad idea for the extent of mods that are done to it. Ill bet that elbow is constricting things a bit, but looks like you have no other choice though.

martysauto

The engine is sucking hot air. That's not helping either.

_Will_

Keep in mind, your transmission and converter have an impact on dyno numbers. Given otherwise identical cars/engine setups, a 4L70 and a 3200 stall just are not going to give numbers that look as good on paper as a manual transmission.

450/430 through a 4L70 out of a 402 seems reasonable to me. Those cylinder heads and those cam specs aren't exactly extreme for a 402 either.

I bet that's a real smooth setup, and a 1/4 time-slip would be a better indication of whether or not you're getting your money's worth from that 402 than a dyno graph.

riggs 74

Yes I have wondered if the numbers between a C5 or C6 compared to a C3 with the same motor but different drive train would be that different. I do wonder if I had gone the route of a manual transmission how much more hp would be at the wheels.

I have found a vacuum leak at the intake gasket and am now taking care of that. I believe the button head bolts were keeping the intake from setting as it should once torqued in place. I am now installing Recessed flat head bolts to gain more clearance. Not sure if I have much gain from this but atleast it won't whistle at me at around 2000 rpm.

The car runs really strong and I do feel that the intake now lets the motor breath and works well with the heads and cam.
I hope to take it to the strip some time to see what it will do in the 1/4, it should do well if I can get it to hook up.

Terry