Cammed LS1 Auto/Stally too big?

[AlexH95]

Hey guys, its probably been posted here before but cant really seem to find anything that thoroughly answers my question. Anyways i've purchased a 5.7L VY R8 with;

1-7/8 4-1 Pacemaker headers
Auspac 2.5" catback
CNC Ported heads
200 cell cats
Ramjet OTR
GM Motorsport Turbo killer cam 237/243 112LSA
Built 4L60E
4200RPM stall converter
3:7 diff gears.

Anyways i've had it re-tuned and it made 250rwkw. Low end feels fantastic but i feel it doesn't pull as hard as it should top end. It only just pulls past my mates stock 6.0L SS at a rolling race both in 2nd gear. I thought something with those mods would demolish a stock 6.0L which is what? 200rwkw factory and weighs nearly 300kg more? Am i expecting too much of my 5.7L? My question is i hear all this talk that a bigger stall converter robs top end power. is this true? how so? does it rob actual street power or just dyno figure power? The tune on the car itself feels fine.

 

[gtrboyy]

6.0l has more torque so will always feel punchier over 5.7.

Think you'll find your optioned up R8 is no lightweight....slap some slicks on it & go drag racing if you want to see it really perform with that setup

 

[ant797]

would this help read full discription ...https://www.ebay.com.au/itm/Commodo...=192627029283153ef8fa751941999c7ae32e77219ad9

 

[lowandslow]

Go and see what it runs at the track with some sticky tyres. Then you will have an idea of its performance.

 

[AlexH95]

6.0l has more torque so will always feel punchier over 5.7.

Think you'll find your optioned up R8 is no lightweight....slap some slicks on it & go drag racing if you want to see it really perform with that setup

Yeah that’s fair. Didn’t think about the optioned r8 situation. I still would of thought the 5.7L with those mods should of packed a lot harder punch mid roll.

 

[AlexH95]

:

 

[AlexH95]

would this help read full discription ...https://www.ebay.com.au/itm/Commodore-VR-to-VE-4L60E-Automatic-Transmission-Transgo-Shift-Kit-HD2-stage-2/192627029283?_trkparms=ispr=1&hash=item2cd9773523:g:bZAAAOSwNtZbcnDs&enc=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&checksum=192627029283153ef8fa751941999c7ae32e77219ad9&enc=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&checksum=192627029283153ef8fa751941999c7ae32e77219ad9

My 4 speed already have a stage 2 shift kit. Love it btw!

 

[Chuckmeister]

At the risk of dragging up the dyno is only a tuning tool etc argument...250kw (335hp) for those mods and that cam seems a little on the low side. Imo you should be looking around 280-300kw.

This guy is closing in to 300kw, same cam on an ls1 (video loses audio during the pull unfortunately)

I have the following in my vx that I had tuned just before xmas at 267kw (358hp) on a stock cam.
1-7/8 4-1 Pacemaker headers
2.5" catback
100 cell cats
VCM OTR
3.9 truetrac diff gears.
Stock cam (as far as I know)

Dont know about your converter but maybe have another chat with your tuner !!

 

[Immortality]

Talking to the tuner isn't a bad idea. Get a dyno printout showing road speed and RPM and then you should be able to calculate converter slip.

 

[AlexH95]

Talking to the tuner isn't a bad idea. Get a dyno printout showing road speed and RPM and then you should be able to calculate converter slip.

I had the dyno sheet which I’ve unfortunately misplaced. I did notice the the torque curve shot up hard and quick but as the car revved out the torque curve was actually decreasing over the run. Could that be because of the stall converter maybe?