Twin 40s Running with a Turbo

hey people, i have been on here before but i cant remember my password and my other email addy has gone down so i opened a new 1…. anyway….

heres the deal i have brought a turbo kit and a set of twin 40 DHLAs and iam going to combine them, and iam just wondering if any1 can give me any info on any at all.

iam wondering more about the air feed set ups, for example the air filters, feed from the turbo, that sort of stuff any info would be great

Rob

not a great combo to be honest. i'd ditch the idea of using the dhla's. sell the carbs and ascociated bits on to help fund fuel injection. what is the car running at the moment?

no the twin 40's leak like sieves under boost, there is a turbo kit you can buy to adapt the dohletto carbs into accept positive pressure but very hard to find.

I personally wouldnt bother using them if you were dead set doing it that way

could you run a supercharger on a single carb?
i've got an abf engined mk1. want to go carb rute. but also want forced induction.  :dontknow:

not that it doesent have enough power already. just being greddy i suppose.

is there any one on here that has had forced induction fitted to an abf?
can you run forced induction on k-tronic mfi?

just after some info/advice really.

cars not a daily.

better to stick with injection for forced induction. you can run super/turbo chargers with k-jet, yes.

I've seen guys run these kinds of set ups on their old BMWs…primaraly with a 32/36 webber. Underlight boost they they seem to hold up. But even the CIS injection system on the MK1 will only take so much boost. I've heard from an old time british racer that carbs will take about 5 psi of boost. Which is nothing to snarf at.

im going for flat top pistons and twin 40's i wud like a turbo but the pressure wud b too much now im not too good on this sort of stuff myself i know you might not like this suggestion but i can reffere you to another forum they should help you out www.vwvortex.com :dontknow:

vortex is a useful site for turbo info. the septics have been at it for years. just bear in mind, as with any site, use it as information gethering, not gospel, then filter out the nonesense. useful though.

MK1US said

I've seen guys run these kinds of set ups on their old BMWs…primaraly with a 32/36 webber. Underlight boost they they seem to hold up. But even the CIS injection system on the MK1 will only take so much boost. I've heard from an old time british racer that carbs will take about 5 psi of boost. Which is nothing to snarf at.

you can run turbos with carbs, that's not in any doubt. cis only takes so much boost? tell that to the ur quattro rally drivers.

cheers people for all th info, after all the help and research i have done, i have decided to knock the turbo idea on the head, iam going 4 a 16v running on my 40s instead

Rob

The lotus esprit turbo used the dhla 40's with a Garrett T3 turbocharger, that coped with a boost pressure 9.5psi (0.67bar).

they leak boost like sieves

I've had a carb turbo'd car and when pressure tested the carb was terrible for holding pressure, comes out of the throttle mechanism and the choke flaps and all the little holes!

I'd build another though it was great but the jetting is really what you need to worry about as it is a black art unless you know what you are doing.

I have a 16v manifold you can buy if you like to fit weber 40's to a 16v engine, good condition send me a pm.

Paul

tallika_fan said

The lotus esprit turbo used the dhla 40's

just realised that they are 45's not 40's on the esprit.