Sincs have already done lots to my car (as per my sig) including a smaller 74mm pulley however on speaking to Wayne today he’s told me that they’ll fit an even smaller pulley 72mm providing I have another full, custom remap. Apparantly the car will run at approx 9psi peak then and be right at it’s limit before needing better pistons, etc.
Anyone else thinking of going down the smaller pulley route? he’s getting 1 batch in (not sure how many that is) soon. If you are I’d love to know what else you’re thinking of doing as in pistons, etc.
…I’m interested! Not sure how long the g/box may kast though!
I will be upgrading the internals, just not yet. Did think about the stroker kit, otherwise it will be a set of mahle pistons, darton sleeves, upgraded oil pump and valve springs as a minimum. Just need a cost effective solution for the gearbox first!
Has Wayne suggested upgrading the internals for the new pulley?
Yeah I reckon it will be the gearbox to go 1st, altho I don’t do many (any!) track days - yet.
Maybe a few of us (ade, me, you and whoever else fancies it) could get a price from a garage for piston, sleeves, etc and get all the engines done together? I personally don’t have the cash spare right now but around Xmas or just after I could go for it.
We’ll all be set for a TVS supercharger then - approx 25% more efficient and powerful than the standard Lotus one which with the uprated engine internals should see us past 350bhp+
I think I would suggest a new gearbox before doing all of that, the 260bhp 211’s are going through gearbox’s when used on track and although your suggested use is not as hard I should think another 100bhp through the gearbox will soon shread it.
Personally I would see how Ade gets on with his modified box or get Sean to fit the Audi box although once you have spent �4k on the box plus mods I guess it gets expensive
the 2.9" pulley we are all running is the smallest I would run on a standard engine, if there are plans to run low comp pistons going to 2.8" (72mm) will not give any improvement as you have just dropped CR, if I was going to run lowcomp pistons I would go to a 2.6" or maybe even 2.5" pulley and aim for 14psi of boost.
I still feel a large amount of the gearbox failures are due to heat and shock loading as much as power, treat your gearbox well and it will last better. Riding the curbs in 3rd will create massive shock loading on the gearset, hence busted gears
One option is to install a decompression plate to reduce the CR, and then go for much smaller pulley. Simple to do, but depends on how much power the standard parts can take - anyone have any idea what the various limits is of the rods and pistons?
Ideally I would like to build another engine. Little point in rebuilding a perfectly good engine when all the wear and tear pieces will be replaced anyway. Possibly an engine thats suffer oil starvation or ihe mileage motor might be good start, then replace the crank, pistons, rods and sleeves etc.
[quote=Whiteysback]Yeah I reckon it will be the gearbox to go 1st, altho I don’t do many (any!) track days - yet.
Maybe a few of us (ade, me, you and whoever else fancies it) could get a price from a garage for piston, sleeves, etc and get all the engines done together? I personally don’t have the cash spare right now but around Xmas or just after I could go for it.
We’ll all be set for a TVS supercharger then - approx 25% more efficient and powerful than the standard Lotus one which with the uprated engine internals should see us past 350bhp+[/quote]
TVS charger is what I want to do. I also think it might lend it self to the stroker kit with its flow rates, bu getting into this level of tuning is more than just bolt on parts - need to find somebody that knows whats going to work well.
Sinclaires have built a few 2ZZ’s with uprated parts along with the 2.0 stroker. Think they got 280whp or something which is well over 300 horses at the fly. You’ll spend best part of �5k on the engine and another �2k on a gearbox.
But 280hp is not that much more than mine (270whp), I’m not convinced by the stroker kit, just stronger pistons with a slightly lower CR is the way forward
Hhhhmmm…after giving the whole thing lots of thought (and speaking with some tuners, etc) I don’t think i can live with spending that sort of money on the engine just to have be counting down the days until the tranny kills itself. I’m now thinking of an audi engine and gearbox swap…I have friends with VAG engined cars that are running 400bhp on standard internals so the enigine is a goodie. I know a lot of the S1 boys prefer the supercharged Honda route (weight, etc) but I fancy something that can produce bigger power should i want it later on. Plus ever since my Spec c impreza I love a turbo…
Agree with Ade - just need to sort the gearbox, and 350bhp should be fairly easy to achieve.
Personally, I like getting my hands dirty with the mechanicals so I would prefer to build a spare engine up myself (I’m a bit sad like that lol!) so I will probably go down that route.
I do have my reservations about the stoker kit, I think the longer stroke might ruin the revvy characteristic of the engine. Would be good to though what work well - oversized valves and revised cams are all options to be looking at, but knowing what spec works well together is a bit of a unknown.
I like the idea of building my own engine but I can see a divorce heading my way should the missus start to find engine bits in the kitchen sink, etc.
Ade I hope your gearbox holds together, but I have been reading about failures even with uprated gearsets, etc. Then again you’ve spent quite a bit more than the usual rebuild costs with a gear box cooler solution, etc so hopefully you’ll be fine. I still wince at the costs though.
Compared to an Audi conversion my upgrades are cheap and I am convinced more reliable in the long run, so many gearbox failures are caused by ham fisted idiot who can’t drive with any mechancal sympathy. As for the cooler it really wasn’t much more money, if youlike doing stuff yourself a fun bit of DIY to be honest and �400 on bits.
Where have you heard of failed Jubu gearsets?
Sorry Ade I can’t be too specific as to exactly which threads I’ve been reading on Lotustalk as it was a few weeks back but there was mention of grearboxes still blowing even with uprated gearsets, altho tbh not sure if they were the Jubu gearsets.
There have been manfailures with the C-one gearset as it is only as strong as the standard one, maybe this is what you have seen, I’ve not heard of any Jubu failures yet…
I’m sure there will be in the future as some people manage to break anything you give them
