I recently did some work to my frc, I took it to the local tuning shop who are by no means experts on tuning LS motors, (first time using hp tuners) but they are very experienced with tuning in general.

mods include

shorty headers, 2.5" x pipe with cats removed (square resonators still on), unknown mufflers
MS4 cam
fast 92mm intake
ls2 tb
slp 85mm maf
blackwing
20% underdrive pulley
160* stat
ls2 style double roller trick flow timing set
melling oil pump
7.400 hardened pushrods
extreme valve springs with Ti retainers

FACTORY 853 heads!



unfortunatly the dyno software was just updated and it won't allow the rollers to load over 125mph, they are working on that right now, but we are sure that is the cause of the sudden drop it did the same thing on a test run in 5th around 4000rpm

but given those numbers we did some quick math and it should do over 460rwhp at 6800rpm which is where the ms4 cam usually peaks at.

pretty happy with the torque curve also, pretty flat above 400ft/lbs from 4200rpm all the way to almost 6000rpm

Next will be 4.10 gears and perhaps a monster stage 3 clutch, I have some 26x11.5x16" slicks on the way and gto skinnies are here, hoping for a 10 second slip this year. What do you guys think?

edit: also just noticed it says flywheel hp and torque, i called the shop and they said that is another problem with the new software, it is actually rwhp and torque figures

 

Really it probably depends on how good of a driver you are. That should be enough motor\gear to get you there. Good luck and report back.

Pitt

 

Thats extremely similar to my old combo in my 2000 FRC. I'd go with the Monster Stage 3 for that car IMO. Works well in my C6Z06 as you can find in here.
My old set up I had the Fast 90mm ported, but I had long tubes and orxp, slp loudmouth catback and 4.10gears. That will be a solid low 11second car with capabilities of 10's in really great air with great driving. You can look up some of my old posts to see how mine did. I had the MS3 which makes less torque typically. I made 444rwhp/385rwtq on a dynojet 224. I look forward to you running the car to its potential and enjoying it.

 

Seem pretty high with shorty headers and LS1 heads. Are you sure the heads aren't ported?

 

I'm pretty sure it's the ported fast 92mm intake that is helping along with the underdrive pulley to get the most out of this setup.

I have no reason to believe the heads are ported, I haven't removed them and the fasteners look stock GM, it doesn't make sense to port the heads but leave the stock cam in the motor, I pulled out a stock cam...

The car has always been unusually fast, before this work with just blackwing and headers/exhaust it would be neck and neck with a pullied cobra 'vert that laid down 450rwhp and 480rwtq, sure my car is 800lbs lighter but he was making over 100rwhp more then I should have been putting down.

I will be going back to do a full pull to 6800rpm shortly and i'll post the new dyno sheet which should have the power climbing all the way up

 

 

new dyno run scheduled for thursday afternoon... we'll see what it does up to 6800rpm

 

Cant wait to see :yesnod
Btw
Is the MS4 the biggest cam(highest lift) that you can use with no flycut?

 

As far as I know yes it is, although it is an older cam maybe there is something else out there now? it is also advertised and designed as the highest power output from a cam only swap

 

So basically you're claiming 460+rwhp from a cam only and FAST 92/92 swap on a stock 853 headed LS1with 346cid. Where my BS FLAG?

When will you be going to a different dyno and also going to the track? Im calling BS until the track times come in.

 

I agree. OP some ppl dont even get those numbers with your exact combo and ported 243 heads. They may have told you its Rwhp/ RWtq, but i believe that may be flywheel. That must be a very generous dyno.
The most ive ever seen with a cam only ms4 with 853 heads and ported fast 92 etc. is maybe about 430.

If those are the actual numbers though that would be awesome man! Congrats on 10s this year also!

Please get some track times

 

The most I've seen was 415rwhp. I noticed it was on a Dyno Dynamics dyno which usually dynos higher than a DynoJet.

His situation is similar to another CF Member on here, (Allgn_C5), whom, had a G5X3/AFR 205 346cid combo with EWP, LG Pros, FAST 90/90 etc. He claimed he was making 490rwhp 440rwtq and when he took it to the track, I believe it ran 12.4s @ 123. Turns out that his car was actually making I believe it was 460ish rwhp/420ish rwtq.

Once the OP get his car to the track, it will let the cat out the bag.

 

Yea your talking about Doug. He stays right around the corner from me lol. Didnt notice it was on a dyno dynamics dyno. But your right, once the Op takes it to the track the cat will be let out the bag.

 

The dyno dynamics dyno at 5252 motorsports is the only dyno on Vancouver Island, definatly the only dyno in Victoria, there may be some privatly owned dynos on the island but none open to the public/customers.

I have been using this dyno for around 5 years, and I'm pretty sure its accurate, they have recently updated the software perhaps the CF needs to be adjusted.

Recently a C6Z laid down 435rwhp bone stock on this dyno in question, I don't think it's a high reading dyno but I agree my numbers do seem high, the heads may be ported, I can't be sure they aren't, but other then the dyno numbers nothing leads me to believe they are ported

I will be going to the track on the first day it opens April 8th, Mission Raceway Park, 25ft Altitude!

 

The G5x3 is what I would consider a little over mild cam - 232-240-600-610 114 LSA, even with the 205's 490rwhp would be impressive, but his MPH isn't too bad.

I have seen quite a few ms4 dynos over on ls1tech over 415rwhp with a ls6 intake, more with fast90+

 

Just checked the dyno thread on ls1tech

MS4, AR 1 3/4 O/R headers & matching x-pipe, Callaway Honker, Ported 90 Fast, ported LS2 Throttle body 462rwhp & 407rwtq STOCK HEADS
http://forums.corvetteforum.com/perf...ock-heads.html

^^^ very similar to mine and doesn't have a pulley

MS3 cam package, LT's, ORY, Loudmouth 1, LS6 intake, SLP Bellow, SLP Pulley, SLP Lid, 32lb Injectors, HSW Tune 429/409 RWHP


Cam only MS4 - 431RWHP 406RWTQ


438 and 410 on a 20 degree cooler day than my last dyno. Cam only MS4, stock waterpump and LS6 intake

467hp/ 446 ft-lbs, still running a little rich. That's corrected BTW - uncorrected was 482/ 461

467hp/ 446 ft-lbs - Vararam, p&p TB, ported FAST 92, SNL experimental cam, TCI UDP, 1 3/4" headers, catless mids, 3" cat-back with X-pipe and 40 series Flowmasters, light-weight flywheel (18lb) & Monster level 6 clutch, Tick Performance level 2 T-56 w/ cryo and REM polishing, Gforce CF driveshaft, stock 3.46 gears, Billet rails, 42# Green-top injectors, Stock bottom end and 243 heads

Custom LS1 Joe Camshaft, Kooks 1 7/8 Headers, 9" Moser 4.70 Gears/Spool Slicks, Rev Springs, Fast 90mm Intake, NW 90MM Throttle Body, Custom T56 6speed, Custom Vacuum Pump Setup
468rwhp/400rwtq on G-Force Motorsports Dyno
466rwhp/401rwtq on MTI's Dyno
473rwhp/404rwtq on Racing Solutions Dyno

 

Do u know the difference between 853 and 243 heads? The 462/407 ms4 cam only number in the link you posted is with stock 243 heads. The 467/446 is with 243 heads also. Why are u posting MS4/243 combos making what ur MS4/claimed stock 853 headed combo is making? Your car is not a freak and your heads are ported.

 

I have an 02Z with Longtubes and an MS4 and my car only hit 428RWHP...so a fast 92 should net me 22rwhp or more since i have longtubes!!!


WEIRD!

 

Your 02 Z has 243 heads, the OPs vehicle has 853 heads

 

I think that was sarcasm...