NITRO UK

Hey guys need some help bad

Finish TVS2300 , SD tune 383 cu in LS6.

Car runs reasonable well except for just off idle ,rev`s up easy but soon as you let up on the clutch it dies, dip the clutch quick and it recovers .

If I give it more revs you can just about drive through it but in stop and go traffic its kinda crap .

Tuner tells me its as good as he can get it , idle is now 1000rpm
1300 when coming to a stop then drops back to a 1000 6 seconds later

This has been done to try and help .

Tuner tells me the cam and injectors are to big , and the cam has low vacuum (which is 15 in hg solid at idle). Injectors are 1000cc mags.

So would you expect my cam to be causing most of my problems , I have been told by the cam supplier he has sold lots of this profile and has never had a customer come back to him with any probs.

Really don't want to change the cam if its just a good tune that I need.

Cam spec is 231/248 .617" /.595" 120+5

No codes , good solid fuel pressure .

Tell me its a tune thing

and thanks for any input .

winters97gt

Could be a number of things, but sounds tune related with that cam. That cam shouldn't have to idle at 1000+rpm. I wouldn't have chosen that cam, with that blower, but I'm not sure it's the cam.

LTstewy8

Do you own the tuning software to make changes yourself? If so, start with the idle tuning guide over on the HP Tuners forum. I think it is in a PDF on that site. It is pretty thorough, the big one being your base running airflow table. Once you've got that where you want it, look into the throttle cracker/follower info, which may fix a lot of your problems. Lots of info on getting those tables working for you is available, also. It's a long process.

realcanuk

You need a new tuner. There is no reason that cam needs to idle at 1000 rpm, or that it cant run properly.

BLOWNBLUEZ06@RKT Performance

Either a vacuum/boost leak or the tune is missing some tricks. Something I can usually fix remotely if you want. Sent you a PM.

NITRO UK

Hey thanks guys .

Sounds like I can leave that sucker in there at the moment .

Will check for vacuum leaks .

I do have efi live but that is screwed up at the moment , up dates are a pita , and does not respond when trying to connect to the flash scan.

Will be looking into getting HP tuners , also have another tuner recommended so hope he can nail it down .

Bret , thanks bud , remote tuning sounds scary but brilliant

Will let you know .

Many thanks guys.

winters97gt

I wouldn't hesitate in the least to pay Brett to send you tunes if you log your car. I'd seriously take that way over any tuner over there.

Pekka_Perkeles

While tuning idle, your car may indeed die.

It may also hang.

Sounds scary, but (idle tuning) it's far from it. Worst scenario is, you'd need to restart the engine. :-)

NITRO UK

Thanks mate , kinda info I need , boy do I wish I lived in tx , remote tuning is almost exactally that , I hear they have guns in tx , not sure how patient Bret is when dealing with idiots

Was thinking scary as in my crappy laptop and internet connection
along with me having to have anything to do with it , techno phob ,yeah a bit lol.

Just a fwiw ,took all hoses off blower , and intake still have a solid 15 in hg .
Sprayed cold start around joins etc , no effect on idle at all , so not sure but don't think I have a vac leak , $hit but what do I know

Thanks guys .

Pekka_Perkeles

I'm bit suspiciuos now.

Do you know, or are you Jeremy Clarkson?

You are, after all, from UK, right? And your tuner is not up to par (bar)?

NITRO UK

no not that much of a techno phob

I`m not him , I don`t know him , that said I did buy an SRT-10 Viper

that I later found had been thrashed around the t/gear track by jc.

BLOWNBLUEZ06@RKT Performance

Well I can tell you that those injectors can be slowed enough to lean it out, so I wouldn't say the injectors are too big.

Spraying around is a decent way to look for vacuum leaks. I prefer to pressure check whenever possible.

NITRO UK

Interesting on the injectors , way to many people have told me to big and you don't need em , so was thinking the slowest , smallest pulse was maybe still to rich at idle .
Also noticed guys on the Cadillac forum are having same kind of probs with this cam 12 -13 in hg and a lot of driveability issues . seems 850 rpm at idle is the norm, some are prepared to put up with bad stop and go problems because they like the rump rump at idle.
Or maybe they need a good tuner as well .


bud

LedfootLarry

I think it's the tune, you should take Brett up on his offer.
I have the same blower as you, only with a 402, running 100lb injectors.
Here is the cam I am running, with great drivability, idles at 875, and puts
Down 705 wheel, tuned by Arun.

NITRO UK

Thanks Larry , will check that with my cam card again ,at a glance that looks bigger .

Think I need to get some $$ together for Bret

_zebra

17° of overlap @.050 for a TVS... wow
you lose a bit of boost?

LedfootLarry

According to Arun, that is BS
13 lbs with 700 isn't too bad
.......no meth

_zebra

no it ain't
from what i understand, it loses a little mid-band to open up the top end (which is where we see the most HP improvement). but wouldn't it lose a little VE when some of the intake air gives the spent gasses that extra push out the exhaust valve?