Gearbox For My Budget Gti6 Turbo?

[peter 20]

Ive built a gti6 turbo engine for my 205 for about £250 id like to start a project thread but cant?

 

Anyway... the gearbox (1.9gti) is far too short as it hits the limiter (6200) in fifth about 135 down the back straight at donnington park so what gearbox would be suitable so it will have a theoretical top speed of 150 ish ?

 

 

many thanks!

[allye 530 3 Cars]

Go into 'project works starters' and start a topic in there, a mod will move it then.

 

As its a track car a 6 speed!

[peter 20]

The 6 speed has the same top speed as the 1.9 ive allready tried it!

 

i'll try projects

[allye 530 3 Cars]

6 speed is geared slightly higher, please do start a project thread, very interested in this as I'm sure others are.

[Tom Fenton 1,525]

it hits the limiter (6200)

 

Why is your rev limit so low on a 16v lump? Even 7200 limit which shouldn't be out of the way will get you something like another 15-20mph in top.

[Daviewonder 533 3 Cars]

I know people using the 2.0 HDI gearbox on GTI6 turbos.

[peter 20]

Well that is my next problem, raising the rev limit on the ecu. as its a 8v ecu.

 

Ill look into the ratios of the DTurbo and hdi box, but i thought they would be far too long

[welshpug 1,622]

Naah, theyre doing 4 and a bit at 115.

 

Sounds like you need a different ecu or find a bosch mapper, only one i know of is chipwizards

[peter 20]

4000rpm at 115 would be 172@ 6000 rpm

 

4500rpm at 115 would be 153,

 

think it might need 2 bar boost

[Tom Fenton 1,525]

Don't forget that as speed increases aerodynamics start to play a big part in power needed to drive the car through the atmosphere. Yes it might theoretically do those speeds at those revs, if it has the power to pull it through the air.

[rallyeash 155]

i thought the gti6 box in theory would do 156mph on the standard limiter. I once had my old standard gti6 off the clock at 140 and still pulling slowly

[welshpug 1,622]

They will pull the limiter...

 

but take a while to get there!

[pug_ham 240 3 Cars]

I've got a hdi box spare, done 162k but no problems with it.

 

mph / 1k rpm is about 29mph on my 306 with correct 195/55/15 tyres.

 

FD is close to same as the 1.9 box, 19 x 70 so 3.684:1.

 

g

[peter 20]

Its got a 306 td box on now, pulls 145@ 6200

 

 

[pug_ham 240 3 Cars]

The hdi box will ought to see that speed at a lower rpm & carry on to over 150 if it'll overcome the aerodynamic resistance.

 

70mph is about 2300rpm.

 

g

[peter 20]

This may be the next step, but for now I'm working on the mapping and increasing the rpm limit.

 

Would be nice to beat that fiesta that clocks 180 :s

 

Rallyeash; My mi16 with gti6 box did 153.9

Edited October 16, 2012 by peter