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Old 16th April 2012, 09:43 PM   #1 (permalink)
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Modded cars - How to get best peformance

All,

It seems the only way to experience the full power and benefit of Stage 1 onwards is to drive using VDC Off, which is dissapointing as I was hoping you could get full power and experience using the RRR setting. No matter what setting I use unless RR and VDC off, i suffer from TC bogging down the performance. - Never noticed this when standard.

Not sure how the 2012 models peform, can only assume the the ECU mapping is better as it will allow a clean start with RRR ?

Thx everyone
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Old 16th April 2012, 09:50 PM   #2 (permalink)
sw20GTS is feeling the need for more powerrr
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Pretty sure the TC is there for a reason However I am curious about this as I plan to go Stage 1 soon-ish as well... I never drive with TC off on public roads so I can't comment how that feels stock but RRR is definitely very fun
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Old 16th April 2012, 10:18 PM   #3 (permalink)
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Odd, even at 610bhp I don't have TC issues. The car just goes and goes...
Never drive it with TC off.
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Old 16th April 2012, 10:41 PM   #4 (permalink)
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Quote:
Originally Posted by CT17 View Post
The car just goes and goes...
Never drive it with TC off.
What do you mean by "goes and goes" ?

You mean it grips like it should, as if it was stock?
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Old 16th April 2012, 10:52 PM   #5 (permalink)
CT17 is probably in an R34 GT-R.
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Quote:
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What do you mean by "goes and goes" ?

You mean it grips like it should, as if it was stock?
Yes, I get the odd flicker of TC sometimes. But that's to be expected on uneven roads. Doesn't stop the car pulling.
The power delivery is very smooth which is possibly why?
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Old 16th April 2012, 10:54 PM   #6 (permalink)
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Quote:
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Odd, even at 610bhp I don't have TC issues. The car just goes and goes...
Never drive it with TC off.
Have you ever done any launches - or foot to the floor starts - I suspect not as you would have understood what I ment - in fact i've had tc kick in once or twice when in 3rd on a (slightly) uneven road...

If you do a Launch using the LC4 @ 4400 revs or LC5 @ 5000 revs TC will kick in straight away giving you a SLOWER performance than normal foot to the floor.

Ben from GTC confirmed - the only way to enjoy pure performance with no TC kicking in is with VDC OFF...

It does make a lot of difference....
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Old 16th April 2012, 11:16 PM   #7 (permalink)
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Never had an issue in RRR....at the lights full power and she goes....take it is not wet where you are and that tyres in good shape??
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Old 16th April 2012, 11:37 PM   #8 (permalink)
MarcR35GTR is Loving Stage 4.5 725hp , 0-100 5.9 , 1/4 mile 10.6 @137mph
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Quote:
Originally Posted by CT17 View Post
Odd, even at 610bhp I don't have TC issues. The car just goes and goes...
Never drive it with TC off.
Same for me also at 610, fantastic grip and go
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Old 16th April 2012, 11:41 PM   #9 (permalink)
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Could be i have uneven roads around me, but with VDC Off i have no problems at all... But even in RRR mode trying to launch it goes from like 4500 revs straight down to 2k then up, so it seems RR VDC Off is the best way for 0-60 and onwards
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Old 17th April 2012, 12:04 AM   #10 (permalink)
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Eneven roads, types of Tarmac, condition/makes or tyres, suspension setup
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Old 17th April 2012, 07:03 AM   #11 (permalink)
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Mines stage 4 and I don't have any issues with grip and my Dunlops are knackered, in fact I did a foot to the floor from stationery pull away last weekend and other than a little wiggle from the rear it just catapulted me towards th horizon.

I dont use launch control though, and my car does have a noticeable delay when pulling off, you hit the loud pedal and the car creeps forward slowly then BANG your away its as if the car is loading up the running gear to help save it from abuse, which is good thing
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Old 17th April 2012, 08:11 AM   #12 (permalink)
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I have Litchfield Stage 4 and also do not have any issues...I think it is the way Iain/ECUtek map the cars where the power comes in gradually whereas Cobb dumps the power...having come from Cobb to ECUtek the technology and delivery of the ECUtek feels much more sophisticated
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Old 17th April 2012, 08:24 AM   #13 (permalink)
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Quote:
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I have Litchfield Stage 4 and also do not have any issues...I think it is the way Iain/ECUtek map the cars where the power comes in gradually whereas Cobb dumps the power...having come from Cobb to ECUtek the technology and delivery of the ECUtek feels much more sophisticated
Glad it's not just me then.
Maybe that's why Iain says gearbox clips are not needed unless you are a Santa Pod fan?
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Old 17th April 2012, 10:08 AM   #14 (permalink)
MarcR35GTR is Loving Stage 4.5 725hp , 0-100 5.9 , 1/4 mile 10.6 @137mph
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Quote:
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I have Litchfield Stage 4 and also do not have any issues...I think it is the way Iain/ECUtek map the cars where the power comes in gradually whereas Cobb dumps the power...having come from Cobb to ECUtek the technology and delivery of the ECUtek feels much more sophisticated
I think you are right the ECUtek launches seem much smoother than the Cobb launches i had previously, i think they match the launch revs tothe engine better.
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Old 17th April 2012, 10:35 AM   #15 (permalink)
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Quote:
Originally Posted by Fmlad2002 View Post
Could be i have uneven roads around me, but with VDC Off i have no problems at all... But even in RRR mode trying to launch it goes from like 4500 revs straight down to 2k then up, so it seems RR VDC Off is the best way for 0-60 and onwards
How often do you launch your car? Sounds like it's every time you take it out!

At 4.5k rpm, you will eventually break something in the transmission if you're doing them that often IMO.

But yes, Cobb launches are all designed to be with VDC Off, unlike the stock 2011-onwards which ONLY do launches with VDC in R.

I usually drive with VDC in R mode on the road in the dry and get only very sporadic interference from it.
On track in the dry, it's VDC Off.
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Old 17th April 2012, 10:58 AM   #16 (permalink)
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OP asked me for a higher launch (to test his new circlips) which i reluctantly gave which is giving traction issues, i have now reduced. we don't dump power, in fact my tunes are known on the dyno for tq coming in later (running lower timing than oem in low to mid) to try save bending rods. dialling in the correct boost, rpms, launch strategy (OP is on LC5), and road conditions all play a part
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Old 17th April 2012, 11:15 AM   #17 (permalink)
CT17 is probably in an R34 GT-R.
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A case of ask your tuner rather than the general public then.
Particularly if you asked for a harsh launch.
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Old 17th April 2012, 11:27 AM   #18 (permalink)
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RRR

RRR is perfect for stage 1.

I run stage 4 and can get good starts in perfectish conditions. the key even if its not a sunny day is warm tyres

did you warm your tyres up??? (with cold tyres even a standard car will struggle to put power down in gear 1)

try driving it for 15-20 mins then having a play)
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Old 17th April 2012, 11:32 AM   #19 (permalink)
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Testing new Circlips, one way to do it

I used to get terrible wheel spin until I switched to Toyo's, love these tyres.

Can testify for Ben maps, not sure how he's managed to keep my engine in one piece but I'm glad it has haha.
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Old 17th April 2012, 12:03 PM   #20 (permalink)
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Clips are one thing, still possible to damage 1st gear and baskets. i am all for smooth take off on oem box



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