clarke5700

as said realy if you had to chose what would it be?? and why?

Christian and Beccy

iTrader: (14)

GRS Twinpass. I think twin-pass works really well on the RST.

mikee_rs

i remember when mark and ahmed tuned my car at grove garage, they told me to ditch the twin pass as it disruptes the air flow to much so i got a custom made grs evo 3 single pass made up. job done

clarke5700

ive heard good things on boath tbh but heard about the twin pass doing some think to called presure drop?????????? any one cair to explain?

slimwynn

twinpass worked well for christian

Oranoco

Opinion on this differs and it really does come down to opinion. Pretty certain mine is single pass and my car's proven itself and when it comes out again I hope it should prove a lot more.

The Airtec stuff is very cheap n cheerful and heavy but chatting to Chris Todd it seems they do quite a good job. If money is tight it's certainly worth a bit more investigating

Christian and Beccy

iTrader: (14)

In theory the single-pass cooler should work better, but in the testing I did, at all but the very highest power levels, the air was cooled much more effectively with twin-pass. I also never really measured any significant pressure drop, it was outweighed by the greater performance of the cooler in any case.

Chip

iTrader: (3)

Twin pass is essentially just the same as having a cooler twice as long and half the cross sectional area.

If you want to cool a lot of air a little bit, you are better off with a single pass, if you want to cool a little bit of air a lot, you are better off with the twin pass.

What constitutes a little bit or a lot, is obviously effected by the physical total size of the cooler.

If want to cool a lot of air a lot, then you just need a fucking massive intercooler (RS500 one for example) which does both.

So its all about which compromise suits you better.


Whats the application clarke? might help people give more advice.

clarke5700

its for my zetec turbo chip 2.0 on a t34.48 only going to be around the 200hp mark at the moment untill i can affored to fit my 6speed so i want more power in time but dont want to keep changing my cooler ect ect. ive got boath so dont no what one to use realy

Chip

iTrader: (3)

I think that either will be fine for that initial application TBH mate, they are both overkill for 200bhp ultimately.

Given the way you like to play around and try new things etc, then looking to the future with upping the power later on I would say go with the better flowing single pass one, and if you get some intake temp issues with it, it will give you an excuse play with water injection, and at least you know that it will not hinder flow.

Christian and Beccy

iTrader: (14)

I ran twin-pass at 350bhp, 171mph.

It's Czech Mate

Presumably a fair bit of boost too?

Ad4m RST

GRS has done the business on these setups whether Zetec/ZVH/CVH/1900 for so long, beyond the generic theory on it I'd just go with what works. Definitely GRS...

rstdave

iTrader: (3)

Grs for the simple fact that it's proven time and time again to work on rst's

clarke5700

think ill keep my grs then lol. air tec intercooler with fans any one??

Christian and Beccy

iTrader: (14)

I have run 32psi with it, but the 171mph run was at more like 1.8 bar from memory.

clarke5700

well if it ran fine for you then ill stick with it dont think ill be running 32psi any time soon lol

andy130

iTrader: (2)

Grs best intercooler for rs turbos

Christian and Beccy

iTrader: (14)

Let's not forget that it was 32psi with a GT30 too.