Right as title really...

 

My zeds fubar, having a rebuild and turbos / injectors...

 

Got good support mods jwt r5 cams, 3" exhaust, 2.5" pipework ba intercoolers, selin dual intake,

 

But which turbos should I go for? I like the look of GT675RS BB turbos, but the newer gtx are probably within my budget,

 

I think I've the setup for the big turbos but not sure which? Hopefully someone can help me work out which is best...

 

It will see track use, as well as drag days etc, not afraid of a bit of lag, but not too much.

 

And going for 740cc injectors

What's up with your engine? The valve stem seals weren't the issue then?

They were 1 issue, but it developed a new fault going round Silverstone, rather then smoking on start up its mow smoking on overrun...

They were 1 issue, but it developed a new fault going round Silverstone, rather then smoking on start up its mow smoking on overrun...

 

Confirmed by poor compression? Oh dear. Pain in the ass this game isn't it.

Not retested it yet, but prior to the head work, it had good compression, but either way I need to move up my time frame and have the engine rebuild, and get some new turbos... It was planned already but was going to wait till the winter...

Looking at Compressor maps. Trying to remember my maths. Looks like gtx2860r is alot better then the gt675, if I'm right the the gtx 2863r and 2867r are probably too big to be efficient.

Looking at Compressor maps. Trying to remember my maths. Looks like gtx2860r is alot better then the gt675, if I'm right the the gtx 2863r and 2867r are probably too big to be efficient.

In layman's terms where do these turbos peak? And for what max psi?

Or do you have to account for volume of air etc so can't judge them like that?

Edited April 28, 20169 yr by Alic

The equations are really complex, not 100% sure I've got them right, but you basically need to know how much air your engine flows, and the target psi, etc.. Etc... ( taking into account it's actually only 1.5l per turbo)

 

I've only look at where I want to be, but looking at it again, now I've finished drawing on the maps, I'll be ordering the gtx2863r, it's more efficient then the 2860 under my target conditions.

What sort of power are you looking for??

I'd like into be capable of 600+ hp, but I've worked my figures for 15psi giving 500ish, and 28psi giving 650ish, based on the gtx2863r. ( assuming my maths were correct.)

would they only make good power top end. and but like a light switch on and of.

Gt675's are very popular, although starting to get a touch laugh by all accounts. However with your breather mods lag should be low. A pair of gt2860s should see 500bhp and be very responsive with your bolt ons. It's really a personal thing, I'd take response with good mid range over a big lump at the top any day. Read some experiences and set ups from owners.

It's why I'm thinking gtx2863r just slightly bigger then 2860, will have a degree of lag, but also a decent bit of power

It's why I'm thinking gtx2863r just slightly bigger then 2860, will have a degree of lag, but also a decent bit of power

 

That's what I would go for.

It's why I'm thinking gtx2863r just slightly bigger then 2860, will have a degree of lag, but also a decent bit of power

 

Having drove GTX fitted cars and GT turbo cars id say for the money the X are not that amazing,I have a 621 hp car now with breather mods and the 675s and it kicks ass,the last GTX 600 hp car i drove was rather laggy even though the owner had spent huge amounts on Ash massives,plainair pipes ect

If there was someone to take advice from, it doesn't get better than that.

I'm a big fan of Power Enterprise turbos. I've driven a couple of Z32s with them. I think they were PE1420s and I simply loved the way they developed boost. Progressive with virtually no lag on them. When I replace mine, whenever that'll be, I think I'll go for PE1420s. Fantastic turbos for a street car and keep the essence of the original fast-spool power delivery there.

 

For me, it's not about chasing numbers, it's about response and drivability.

That's interesting, Looking at the maps thought it would be different, good to hear from someone who's experienced both, and if the 675 can produce 600hp sounds good to me, can spend the extra money somewhere else, thanks.

What happened to your old inter cooler set up ash? Out of interest?

Gave my eBay smics to Ali, and my fmic going to baz, ( thanks for the reminder should have dug that out of the garage weeks ago)

 

My zed goes to the bodyshop next week so the bumper will be available soon.

Edited April 28, 20169 yr by (adl) phoenix

Any updates Ash?? How's the car coming along at the bodyshop?? Any pics??:thumbup:

None as yet, not sure there much to see. There's not getting as far as I'd hoped, ordered my bits from z1, GT675RS turbos, 740cc injectors and a rail. Waiting on my walbro 450 pump to turn up too, all very boring at the moment lol.

None as yet, not sure there much to see. There's not getting as far as I'd hoped, ordered my bits from z1, GT675RS turbos, 740cc injectors and a rail. Waiting on my walbro 450 pump to turn up too, all very boring at the moment lol.

 

Did you order your new downpipes :whistling::innocent::biggrin: