Is my 1.3 sick?

Post by **McGyver** » Thu Jan 31, 2008 8:47 pm

well after reading that alot of you guys are running around on 31inch+ tyres, stock motors and can still hit 100km/h im not impressed.

ive got a stock 1.3 in my 95 sierra with 31's and stock gearing (untill gears from low range are delivered) and i go backwards in 5th so its 4th gear and about 90- 95 km/h. if i hold 4th gear pinned on flat road i could get too prob 110 after about 3 kays run up

i am guessing this is not normal?

Post by **Gwagensteve** » Thu Jan 31, 2008 8:54 pm

Yep, I reckon that's normal. you're about 19% overgeared so instead of doing about 3350rpm @ 100kph, you're trying to do 2750 or so. if you downshift to 4th, your back to 3500rpm @ 100, which is what you need to be at.

A 1.3 doesn't make enough torque at 2750 to hold speed.

Regear your car, its the cheapest option, and makes it heaps better offroad. look for transfer case gears with about a 20% high range reduction and you'll be happy.

PS, as an aside, a 19% taller tyre on a landcruiser is a 38. nobody would expect much road performance with stock gearing and 38's on a cruiser and it's the same with a sierra.

Steve.

Post by **MART** » Thu Jan 31, 2008 8:54 pm

No , Cheers Paul.

Post by **Gwagensteve** » Thu Jan 31, 2008 9:04 pm

Really Paul? I haven't been in a stock geared sierra that will hold 5th with 31' s on it.

Steve.

EDIT do you mean No, it's not sick or No, it's not normal?

Post by **McGyver** » Thu Jan 31, 2008 9:11 pm

yea steve i have gears on the way from low range as we speak, i expected it to be this slow but, i have 2 mates with older sierras than mine one can wind his off the clock with 31's and the other can fry 30's on road in second gear, plus i keep seeing people on here talking about there stockas that still go rather well?

Post by **Big D** » Thu Jan 31, 2008 9:17 pm

well i have stock everything with 27'' tyres. i can get to about 140-150 top speed

i have differnt gearing to u i think though as myne is a 98 model.

Post by **ofr57** » Thu Jan 31, 2008 9:20 pm

wow you can acutely GET to 100 less than 3k's

took me about 10

Post by **Gwagensteve** » Thu Jan 31, 2008 9:25 pm

They must have some pretty healthy 1.3's because that's not my experience with stock geared cars.

It's all in the gearing. I can cruise at 100kph in 5th empty and 4th laden in my 660cc LWB car that has the same power and less torque than a stock 1.3... and I'm running 34" tyres with TT 6.4 transfer gears and 4.11 diffs.

Steve.

Post by **crackatinny** » Thu Jan 31, 2008 9:27 pm

Big D wrote:well i have stock everything with 27'' tyres. i can get to about 140-150 top speed i have differnt gearing to u i think though as myne is a 98 model.

thats cos 27" is standard. i can get mine to the 'h' (on Kmh) at the bottom of the speedo. but yeah, thats stock as a rock.

McGyver, how much are you paying 4 the gears? i am keen to get 31's too.

Post by **McGyver** » Thu Jan 31, 2008 9:34 pm

oh well that makes me feel a little better, so i will wait for these gears i suppose, and shit i hope nuthin goes wrong with the gears seeing as they will be put in next week and next w/e ive got a campin trip 5-6 hours drive up the coast.

Post by **McGyver** » Thu Jan 31, 2008 9:46 pm

also how long does stuff normally take to arrive from low range? anyone know

Post by **JrZook** » Fri Feb 01, 2008 2:07 pm

When was the last time u had your carb cleaned? Seen quite a few cases where the vacume port to open the secondary throat has been blocked by carbon and hence crappy performance.

Dan

Post by **vicelore** » Fri Feb 01, 2008 2:36 pm

i got 32s and i find it hard to hit 100 in any gear.nearly the only time i can is down hill with no wind... but yea 100 is pretty scary in my car. so i just cruise on 85-95 in 4th up hill and 5th in the flat/down hill.

i was really hoping gearing would help me hit 100 but didnt really. offroad its unreal tho. so if i wanna go fast i just take my DD subaru.

Post by **MART** » Fri Feb 01, 2008 3:13 pm

Don,t have a problem doing 100 , with stage 4 rockhopper , 4.88 hilux gears , 35's , does it quite easy , sits arround 3600 at 100 and arround 4000 at 110. But i have a few engine mods , Cheers Paul.

Post by **vicelore** » Fri Feb 01, 2008 3:21 pm

was thinking your blown and EFI arnt you.

does anyone think mines underpowered ? just interested.

Post by **MART** » Fri Feb 01, 2008 3:39 pm

Vicelore , you might need a cam and a bit of head work , I paid arround the 500 mark for a fully ported head and a cam regrind , matched inlet and outlet ports , valve guides chopped away completely so it breathes very well. Yes I do have EFI , A TBI off a 90 model swift , cost 300 for complete kit , made my own adapter to fit standard manifold and cut the two holes out of the standard manifold to make just one hole , currently running 3 pound till it is dyno-tuned , revs too arround 6500 rpm but it pulls right through the rev range , Cheers Paul.

Post by **dank** » Fri Feb 01, 2008 4:08 pm

if I was ever going to replace my engine i'd probably go a 1.6 bottom end and DOHC GTI head and EFI. apparently is a sweet combo that the swift guys use in the racing circuits....thats about all i know about it.

edit: did some digging around...a claimed ~95kw at the flywheel with exhaust and intake, plus buggerising around with the ECU, bigger injectors, etc...

Post by **Gwagensteve** » Fri Feb 01, 2008 6:21 pm

The GTI head flows LESS air than the 16V SOHC vitara/Baleno head. Add that to the age of the GTI motors, the cost of the head, the stuffing around with the dizzy, etcetceetc

A g16B Baleno runs nearly 72 KW and 134Nm - the highest stock torque of a G motor and almost the most power with no stuffing around with building a bitsa.

Steve.

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Is my 1.3 sick?

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