Christian and Beccy

iTrader: (14)

Just thumbing through the latest Practical Performance Car magazine and couldn't help LOL'ing and PMSL'ing at the Mini in there fitted with a 1.8 B18 Honda engine and a GT3076R Externally Wastegated turbo. The guy is looking for 250-300bhp.

My money is on boost at around 5000rpm and his upper target of 300bhp with only 7psi needed.

Why oh why fit such as HUGE turbo when your aspirations are so low. That turbo would do well over 500bhp on a 2.0 engine. I'd bet a GT28R or GT28RS would have done that.

Dave Walker will be tuning it, surely it wasn't his idea?

Markb_s1

cos you bought it based on feeling the need for an externally gated turbo?

sbd16v

i tell everyone my new engine will make 300 bhp, thats about all im going to say on the matter

JonnyBravo

Exactly my opinion Rob.

CalibreDan

I always thought that oversized turbos on VTEC's was the done thing - Keep the CR high, NA cams with some overlap, and throw boost at it higher in the rev range when the VE drops?

Stavros

Indeed. From what ive seen of them, as they rev so high you need a bigger than what most expect turbo so it breathes well at high rpm, as he will no doubt be pushing it to 8k+

Id put money if you put a 28R or 28RS on it itd feel dead as fuck at the top end.

Red16

same turbo/wastegate set up im collecting tomorrow if the bloke who said he wants to buy my bike actually turns up today with the cash

yeah the mini owners figures seem a tad underestimated, but maybe hes just not one to brag about things.

Oh and Dave Walker (The Emerald guy in Norwich) doesnt know shit about turbo's! He said my mates 2ltr zetec engine with Cosworth t3 turbo wouldnt make anymore power if the boost was increased past 9psi... all that would happen would it would get hotter and then it would start losing power. He said because it came on boost so early the only way to get it to make power past 5500rpm was to fit a much bigger turbo.

foreigneRS

agreed

had the mag about a week now and haven't even flicked through it it usually comes at the same time as 2 bike mags that i subscribe to, and is the last to be read these days

Christian and Beccy

iTrader: (14)

But surely regardless of everything else, it's going to be hard to get that engine to only produce 300bhp on that turbo? I can see the logic with the high revs thing, but just can't imagine that doing what they are suggesting.

Martin-Hadland

iTrader: (2)

Saved me replying!!

Rick

Classic Mini? Pics?

Gordon1

we have a honda that we map and it has a gt3076r and 1 bar is 450
and not laggy at all

JonnyBravo

Got a link to that anywhere Gordon ?

foreigneRS

i would be more concerned with the small size of his intercooler with a high CR, but i suppose if it is low boost then the compressor outlet temps will be reasonable

Gordon1

i will try and find 1 for you

Chip

iTrader: (3)

So basically only christian doesnt understand basically?

Guy wants an unrestrictive turbine that isnt working too hard at high rpm, doesnt want masses of midrange torque that brakes traction and is probably understating the power he thinks it will make anyway like the vauxhall lads normally tend to (ALL the TOTB last year claimed 300bhp and then went on to run 11s and 12s)

Anyway, ford used a 320bhp T3 to make 200bhp on a YB and that worked well enough!

Chip

iTrader: (3)

Ps

My nova in its current state of tune drives very nicely indeed (ask PeeVee he came out in it the other day if you dont want to take my word for it) isnt laggy, and makes a whopping 300bhp or so on a GT35R on a 2.0 16v engine at 0.7 bar.

High CR, low boost, works fucking mint, especially for fwd cars or light cars where you dont want big midrange torque, welcome to the 21st century, lol

Christian and Beccy

iTrader: (14)

No, re-read the main context of my original post. I just cannot see how a GT3076R will only make 250-300bhp. Gordon has already said that he knows of a Honda engine running 450bhp at 1.0 bar. So, that was my main point.

Chip

iTrader: (3)

Did he say what boost it will be running?

How much do you think it will make at .4 bar for example?


Cant see what your problem with it is TBH if he only wants to make that much power its still a perfectly reasonable choice of turbo IMHO if he wants to do so at high rpm with minimal EGTs!

lead_foot

iTrader: (1)

Maybe surprize??

cozmeister

iTrader: (1)

Mr Walker's in Watton, I believe....

Is that with the standard Zetec cams and pistons? Or have you got ones designed for a turbo application running boost higher than 1 bar? Or did I misunderstand CalibreDan:

Yes I know a VTEC isn't a Zetec, but they're both N/A engines which Honda and Ford respectively, didn't design to have a turbo stuck on the side at the factory.

Feel free to help me understand, people

Red16

Well were on about the same bloke in that case...

standard zetec head and cams, 8.2:1 C/R with JE pistons and Eagle Rods, Rover inlet, tubular exhaust manifold, cosworth t3, pro alloy rad/intercooler

Charlie Chalk

iTrader: (1)

Scan the pics in please Christian.

Dave_YD

http://www.ek9.org/forum/forced-indu...-projects.html

i believe in that link, one of the cars was mapped by gordon1

a gt3076r is ideal for a vtec, will have full boost by 5,500 rpm-ish...but will rev round to 9k easy so a good powerband

honda lads dont tend to run high boost on a smaller turbo, CR is usually 9:1 on a built engine so boost is kept lower on a bigger turbo.

as has already been said it helps with launching etc...just look at that civic with 450 bhp it did 11 dead