.....he's a very, very, very, naughty boy.

[LuckyP]

Had a missed call from the factory today. Called 'em back.

Richard had called after watching the Brands Vid and the Honington V-max run.

He and Ted thought that I was keeping the revs too high for too long. They reckoned that by dropping 1000 rpm I would lose no time on the track (and perhaps even gain) and preserve the engine more. Looking at the Vmax event it is kind of scary that the std G50/03 ratios got me to 7000rpm and 172 about 3/4s of the way down the strip.

My reason for going so high in 3rd was that I have increased 4th (and 5th) and the jump is now about 1500rpm which is quite large. But looking at the vids again, I see that my high shifts brought the revs down to 5,500 which is 1,200 OVER max torque (517@4300). Richard suggested a 6500 chip to kind of 'train' me into shift in the band.

They added that the type of treatment that I was giving the engine would be better handled by a 640 or 720 engines which do better at high RPM

Think I might try it.

What do you think?

Lucky

Edited by LuckyP on Friday 29th June 22:04

[bluesatin]

look forward to seeing the 720bhp engine soon then!

[Boosted LS1]

7000 rpm doesn't seem high to me so long as it's all good stuff inside the engine. That said, if you're not making any gains then I'd use a lower rpm. You need to do some maths to see where your shift points should be.

Boosted.

[deadscoob]

If you're thinking about going for a 640, wouldn't you be better off changing to an LS7?

[LuckyP]

deadscoob said:

If you're thinking about going for a 640, wouldn't you be better off changing to an LS7?

Eeek. No! I meant I'll try not to take the engine to 7000 for extended periods, not that I'll try a new engine!!

But yes. Having my time again, it's an LS7 I'd go for.

Lucky

[LuckyP]

Calling SteveD,

I know you sent me the shift doc with my new 4th and 5th ratios, but whilst trying to add my dyno readings, I fooked the original.

Can you send it me again? Or if you would be so kind, put these torques in and post the results. You have my new 4th and 5th ratios yeah?

3957 496
4100 507
4200 511
4300 517
4400 516
4500 512
4600 515
4700 516
4800 513
4900 514
5000 507
5100 502
5200 501
5300 498
5400 493
5500 490
5600 487
5700 485
5800 481
5900 478
6000 477
6100 475
6200 470
6300 465
6407 457
6592 431
6700 401
6769 354

Cheers

Lucky

[Stig]

Sounds like good advice to me. Use the torque in the lower revs and shift early, it's kinder to the engine and won't affect you performance wise. Whilst it 'sounds' faster at higher revs, look at the power/torque curve from a dyno and see how much it drops off.

[Steve_D]

Peter
If you send/post your dyno figures and new gear ratios I can run them through the gear calculator.

Steve

[andygtt]

I used to rev my car to 7000rpm on the track and even slapped a 7500rpm chip in it once and kept my foot in until it hit the limiter to ensure I hit 60mph in 1st.... My engine did have solid roller lifters though and produced the power higher up.

However even I beleive hitting the rev limiter in top gear is asking for engine trouble.

edited to add, I think you definatelly should put in the 6500rpm chip.

Edited by andygtt on Saturday 30th June 09:22

[LuckyP]

Steve_D said:

Peter
If you send/post your dyno figures and new gear ratios I can run them through the gear calculator.

Steve

Cheers Steve, I'll just try to find the 4th and 5th ratios.

Where did I put it now.......

Edited by LuckyP on Saturday 30th June 09:28

[LuckyP]

LuckyP said:

Steve_D said:

Peter
If you send/post your dyno figures and new gear ratios I can run them through the gear calculator.

Steve

Cheers Steve, I'll just try to find the 4th and 5th ratios.

Where did I put it now.......

Edited by LuckyP on Saturday 30th June 09:28

0.688 custom Powerhaus II 5th and OE 0.967 4th. 1st, 2nd, 3rd all std G50/03

[deadscoob]

Sorry, thought when you said, "should I try it", you were feeling flush and fancied a few more HP

[dilley]

I run a 6k chip just to be safe, the car is actually quicker.

[SimonMaidenhead]

Maybe someone can tell me the optimum time to change gear

RPM lb-ft hp
4500 553.6 474.3
4600 555.5 486.6
4700 571.1 511
4800 572.6 523.4
4900 570.7 532.5
5000 564.6 537.5
5100 557.2 541.1
5200 545.7 540.3
5300 544.6 549.6
5400 540.9 556.2
5500 539.5 565
5600 536.8 572.4
5700 537.5 583.3
5800 530.6 586
5900 524.8 589.5
6000 512.7 585.7
6100 507.1 588.9
6200 498 587.8
6300 495.5 594.3
6400 487.3 593.8
6500 486.4 602


Thanks in advance


Simon

[LuckyP]

SimonMaidenhead said:

Maybe someone can tell me the optimum time to change gear

RPM lb-ft hp
4500 553.6 474.3
4600 555.5 486.6
4700 571.1 511
4800 572.6 523.4
4900 570.7 532.5
5000 564.6 537.5
5100 557.2 541.1
5200 545.7 540.3
5300 544.6 549.6
5400 540.9 556.2
5500 539.5 565
5600 536.8 572.4
5700 537.5 583.3
5800 530.6 586
5900 524.8 589.5
6000 512.7 585.7
6100 507.1 588.9
6200 498 587.8
6300 495.5 594.3
6400 487.3 593.8
6500 486.4 602


Thanks in advance


Simon

With figures like that, it doesn't really matter does it!??

Are you bringing it tomorrow? Please......

[SimonMaidenhead]

^^^^^ Weather pending, only have the aero screen at the moment, so pray for sun.
Be interesting to see what the noise levels are like as well.

[ultimad]

Hi Simon what engine you get in there ?

[LuckyP]

SimonMaidenhead said:

^^^^^ Weather pending, only have the aero screen at the moment, so pray for sun.
Be interesting to see what the noise levels are like as well.

I'll bring the noise meter. I think we could be lucky tomorrow with the weather.

[SimonMaidenhead]

ultimad said:

Hi Simon what engine you get in there ?

It's a Peter Knight engine, basically a na version of what GTWayne is using

[Steve_D]

Peter
I need your dyno figures to go with the new gears as it works out the best torque in each gear.

Simon
I need your gearbox type G50/??.

Steve