65442

I am planning to piece-together an LS1 for the purpose of dropping it into a FFR Daytona Coupe, such as mmarshall has done. There will be no nitrous or forced induction. Would like to spin it to 7000rpm.

LS1 aluminum block (5.7)

Compstar 4" crank

Compstar rods

Diamond or JE pistons (11-11.5 CR)

ported 241 heads - https://ls1tech.com/forums/generatio...ics-added.html

Yella Terra pedestal/shaft rocker arms

Custom cam from Comp, Pat G, Tick, etc.

Morel lifters

ported FAST 92 intake manifold (would a FAST 102 be overkill?)

FAST or Nick Williams 92mm throttle body

No MAF (speed density tune)

LS1 ECU/PCM (I have read that the stock unit is very capable and should be more than enough for my project)

custom 1 3/4" or 1 7/8" stainless headers


Thoughts? I would like to achieve something in the 550hp (flywheel) range. But I would also like to maintain a flat power curve. This engine will be used in a car that sees time on the street, autocross course, and road course.

65442

Over 100 views and nothing?

My primary concern is: will I benefit from moving up to a FAST102?

JakeFusion

iTrader: (7)

Get a balanced rotating assembly from HKE or TSP. They'll do Compstar Rods/Crank or K1 or just about anybody you want and Wiseco or Diamond pistons. I'd recommend the Wiseco for the LS1 because of the ring package and the price. You can also get coated bearings and it can be balanced. Pretty nice.

You can get by with LS1 rockers because you have 241 heads. No need to run a heavy aftermarket roller that's prone to breaking. Put some upgraded trunions in the stockers and be good to go 7k+. Just make sure you have the right valves in the heads and the right lobes on the cam.

As for the custom cam - I'd recommend EPS as they now have their cams ground by Cam Motion. If you do PatG, he'll set you up with an EPS cam (or at least he did end of last year when I talked to him). Geoff is also great to work with and can help set you up with something pretty special.

FAST 102 all the way - better intake. Hell, if you can fit the Cathedral port truck 102 intake in your car, do that. It destroys the car intakes. If not, get the 102. Also, the 92mm TB is okay, but I'd recommend the FAST TB as it's designed to work with the 102 manifold (actually fits the hole). I did a port matched 102 and FAST 102 TB. In fact, there may be some gains on a stroker and the price is the same between the 92 and 102 TBs. The FAST 102 TB is easier to tune as well since it has a lip inside it for low-speed airflow/idle tuning, so no real reason to not get it.

I don't think you need to go SD, but it might be easier than dealing with a 4" MAF housing and LS7 sensor in your car. So it'll work ok.

1-7/8" Headers all the way. I don't know what will fit the car, but TSP has good budget stainless headers and Kooks/ARH have really awesome headers. I wouldn't consider a 1-3/4" header on an LS1. Every single swap on here from 1-3/4" to 1-7/8" shows gains and no loss anywhere.

LS1 ECU would be fine. Anything newer will make bigger cams drive better, however, as they are faster.

65442

Thanks, Jake.

I plan to get the pistons/rings/bearings/crank/rods from TSP or one of the others. Will have them balance it, too.

Forgot to mention that I'll be running a Star vacuum pump and a light ring package. Might even use a dry sump pan setup.

The stock steel rockers look like nice pieces, after the trunion upgrade. But are they really light enough for 7000rpm? Any HP to be gained with the Yella Terra rockers?

So the FAST102 and 102mm TB would not be overkill for a set of ported 241 heads? I have the flow #'s posted in the link from my original post. I was worried that the 102 might be too much for the heads. But if that is the way to go, then all the better!

I was thinking that 1 7/8" headers would be the way to go. They'll probably have to be custom made because the Daytona coupe is made for a ford motor and is far from being an F-Body.

What sort of a price difference am I looking at for an aftermarket ECU? What about performance gains? Recommendations? I'm more familiar with carburetors than EFI. This is new territory.

JakeFusion

iTrader: (7)

I'd honestly just get the LS1 ECU. It's good even for 3 Bar with a software upgrade. No since in going with something aftermarket or going backwards to a carb.

I see the flow numbers for your 241s. The FAST 92, IIRC, tops out in the 285cfm range, and the 102 is closer to 300 before you do any work to them. So out of the box, the 102 is a bit better.

And the stock rockers are the lightest rockers you can put on the car. Martin@Tick spins his engine to 7400 and Brian Tooley has a couple of the TEA Stage 2 LS6 heads and TFS 215s running 7400 with the stock rockers. Just don't go crazy on the lift. Keep it under .630". I'd suggest you talk to Brian Tooley as he did spintron testing of the stock rockers and they are the best for high RPM applications.

Sales@Tick

iTrader: (3)

I'd be glad to do a cam for your set-up and get your valve-train set-up in the right manner. Shoot me a PM with your email address so I can keep in contact easier with you and your build questions.

LoneWoofer

Watching this thread closely.

Picked up an ls6 block and 243 heads this week.

I'm gonna go 383 too. I think I want to put it on the juice. Not sure how that will effect my build, guess I will go do some more reading.

garygnu

the vac pump should be good for 10hp.do some easy brake in pulls with out the vac pump,just use some valve cover breather .

65442

Thanks for the info, Jake. Sounds like the FAST102 might be my best option. I'll contact some of those guys about using stock rockers with my setup.

Martin: Thanks. I'll be in-touch.

Lone: Good luck with your build. Be careful with the juice. That's one thing that I have no interest in. It's hard on parts. And one solenoid malfunction can ruin your motor.

Gary: The vac pump should be good for closer to 20-30hp with the correct ring package. And I'll break it in properly on the dyno.

65442

Jake: Almost forgot to mention that I was thinking about installing a cam with around .610-.615 lift. Should be safe with the springs that I have. And you can see on the flow bench #'s that it doesn't do much more between .600 and .700

JakeFusion

iTrader: (7)

Which PAC springs? I like PAC. I have PAC 1904 dual springs on my heads...

If they are the 1218 or 1518 then you're good to go as long as the cam isn't built on the most aggressive lobes you can find.

Sales@Tick

iTrader: (3)

The springs we include in our cam packages are Brian tooley racing springs and we use his platinum springs good to .660" lift with stock rockers. For your build and 90% of the n/a builds I help build that aren't using ls7 heads valve lift on a 1.7 rocker doesn't exceed .624"/.615" or .624"/.595".

Sales@Tick

iTrader: (3)

I just clicked your cylinder head link and see that you're running PAC beehives. That is not a problem and I have several families of lobes I use that will work in perfect harmony with a beehive spring.

Exhaust port looks really nice on those heads. He did a very good job.

I recommend the morel 5206 lifters and at least 11.5:1 compression if not more depending on cam timing to bleed cylinder pressure off.

garygnu

I made 25 hp with a vac pump and lite rings on my 509 bbc,761 hp,626 tq..I had a moroso vac pump.

Detoxx03

iTrader: (14)

Stick with the 92

96lt4c4

iTrader: (5)

Keep the 102, ask Tony Momo about the fast 102 even on a stock cube LS1. You may want to take the TB size down, but if it were me I would run the 102 TB on it as well. I am running them both on my 402, and I would be running them both if I was building a 383. May sound like a lot of money but once you get them in your hands you will see why they are very nice..

I am also keeping the MAF, I will be running the LS7 MAF. I have HPtuners and do tuning on the side so I feel like I should be able to dial it in. It may not be for you if you plan on having someone else tune it. Just depends on if they are familiar with it or not.

1998silverbird

iTrader: (29)

I have a 383 motor and have a set of lightly ported 243's ( only combustion chamber work), a 238-248 cam, 11.3 compression, and a Typhoon 96mm intake setup with a NW 102 TB. I made 461 rwhp with that setup through BBK headers and a 2 1/2 inch ypipe. That is about 542 flywheel hp. I think I have about 4000.00 into eveything parts wise. I am sure if I put some 1 7/8 headers and a 3 inch ypipe I would be in the 475 rwhp range. My advice dont get all hooked on the intake setup. I made 448rwhp with the LS6 intake on it. With a fast 102 setup you will be in the 1100.00 price range alone with the intake a fuel rails and another 300.00 for the TB. I would say do a Fast 92 or do like I did if you only looking for 550 flywheel hp. Think I have around 650.00 in my intake, Fuel rail, and TB setup!

Sales@Tick

iTrader: (3)

If you already own a Fast92 there is no point in buying a 102.

65442

Jake: My springs are PAC 1219's.

Martin: Thanks for the info. I definitely plan to use Morel lifters. They have served me well with my 461 Olds. Also, I do not already have a FAST92. I have no LS intake right now.

1998silverbird: Thank you for the info. I am aiming for around 550hp. But more is never a bad thing. If the 102 will make more power without hurting the low end of the power band, then I'll buy a 102.


So I am hearing some in favor of the 92 and others in favor of the 102. Other than the FAST intakes, what are my other options? I want to stick with FI, not carburetor. And it will have to fit under the hood of a Daytona coupe...so it can't be too tall.

JakeFusion

iTrader: (7)

102 all the way. Anyone who has dyno'd them back to back will say 102.

If you can fit the Truck 102... the LSXRT... Do that. It crushes the car intake by like 15HP.