martinmilne

right im confused i have a xr3i gearbox in my turbo its a efi engine with 195 chip biege injectors std intercooler and made 169bhp at totd but when i drive it it revs very high for the speeds im doin its bout 6000 revs at only just over 100mph is this down to the gearbox or is it something else just want to know if a turbo box would help my cruising speeds ??????????

Rich_bloor

your speedo might be out, get a sat nav that shows speed and see what that says when your doing 100.

martinmilne

yeah had one in the other day and only was couple of mph out wat kind of speed should i be getting?

Rich_bloor

u should be topping about 120? im not sure tho, i aint eva owned one of em.

martinmilne

well standard figures say 127 but mines chiped and bigger injectors so was hoping for at least that but its imbarressing when vans are beating me on motorways

martinmilne

any ideas

orionmojo

iTrader: (1)

mine had a chip, bigger ic and the s2 box with lsd.

it topped out at 125 on the clocks, so that'd probably be closer to 105-115?

martinmilne

so wat does the rs turbos use who have top speeds of over 130 ? how much power do they have if i upgrade to 200ish bhp would i still have the same top speed ???

orionmojo

iTrader: (1)

possibly abit more yeah, but its all about power bands too, i mean you've got to be pulling close to 6k revs at those speeds, and how much useful power is up there?

not alot.

Karlos G

iTrader: (4)

If your speedo is correct (which you say it is) then it can only be down to gearing, 100MPH @ 6000rpm is not right if your in 5th!!!! Are you actually doing 6000rpm or is the Rev counter faulty maybe?

martinmilne

well i think its right but it feels like its got more to give but dont want to ruin my engine as its reving so high how can i make sure its showng true revs

orionmojo

iTrader: (1)

it should idle at 800 iirc

Karlos G

iTrader: (4)

Think it's 950rpm idle, but even if it shows idle correct it might not up in the revs, I had one that would only get to about 2500rpm! Obviously the car kept going was just the needle that didnt get any higher!

martinmilne

yep it does so its got to be gearbox ?? or would that not make a diffrence to the revs ????????? im really confused

orion88

that box wont last tho mate u need an lsd

Karlos G

iTrader: (4)

Sounds like someone has maybe changed the Final Drive in the box for more acceleration and less top speed?!

orion88

soon enough it will sound like a bang and theyre will be no ratios

martinmilne

so would a turbo box be better for cruising speeds as its really bad i could buy a 1.1 and do 100at top revs

RabReith89

I have a xr3i gearbox in my rs mate

But i have had it of the clock on the motorway 140+

Gonna get the lsd gear box tho to much wheel spin

project rs

sounds like a combination of things you.ve probably got a early xr3i box in with the 4.29 final and possibly got a speedo that is reading right as the old xr3i on standard wheels used to read around 120 at 6000 take away 10% inaccuracy and your back to 108 not that far from what you.ve got given the rev counter could be out 100/200 rpm at that stage your probably back to what your reading. bang a series 2 box in it and you'll notice a big improvement 100mph a touch over 4250 rpm

white2lsr

iTrader: (1)

Have tried putting it in 5th?

martinmilne

wat spec is your engine as im tryin to work out if its the gearbox or something else i know the gearbox is not going to last long but its not broken i dont want to spend money on something i dont really need

Karlos G

iTrader: (4)

I have heard 'stories' of peoples XR3i boxes lasting really well even on cars laying down 200+BHP!! You might be suprised, I think it's all about the hard launches really.

orionmojo

iTrader: (1)

and mega revs.

if you keep thre revs sensible then they seem to last alot longer.


but wheres the fun in that braaaaaaaaaaaaaap tish braaaaaaaaaaaaaaaaaaaap tish

Karlos G

iTrader: (4)

hehehehe quality!

Christian and Beccy

iTrader: (14)

Mine pulls off the end of the speedo too.






























in FOURTH.

Oranoco

Just realised you're the chap who joined us at our rolling road day in September at TOTD. I'm Steve the guy running the Audi A4.

Your car on the rollers

martinmilne

that would be me mate had it sorted since that day when it ran 134bhp now set up running 169 but just cant seem to use it !!

mr_joe0606

iTrader: (1)

i heard the standard gear box wud limit out at 140mph. i have had mine to 130mph on a air feild of course lol. but there was brown stains on the seat haha.

just wundering what gear box's are ther to get better top speeds and to run more power throgh.

sorry for the hi jack mate.

crazycage

ive got s1 ratios in my fiesta turbo and i can pull 154mph on 15"wheels .

martinmilne

wouldnt mind knowing to i know the mtx75 box is meant to be good 60mph in second !! but does it cope with the power?

crazycage

you can do 60 in 2nd on a bc box ,mine does 61 and im on s1 ratios and 15s

Christian and Beccy

iTrader: (14)

I always thought S1 ratio's were short? I had what I thought were S1 ratio's in mine YEARS ago and used to bounce off the 5th gear limiter in well under a mile.

crazycage

they are 4.27 final drive .

Christian and Beccy

iTrader: (14)

So, how can you do 154mph on those ratio's on 15" wheels?

crazycage

on 215/50/15s and a 7500rev limit but only need just over 7k for 154

martinmilne

wat have you got in yours now wat spec is your box?