IDI turbo

have a look through the rat and retro mk 1 picture thread, i'm pretty sure there's a picture of just about every colour mk 1 in there!

hey mate,

mollins' car uses the 1z TDI engine which is the first generation VW direct injection engine. its uses the same bosche VW rotary pump with all the same interior workings as is present on the IDI engines, but with component differences (cam-plate, plunger diameter, throttle assembly, dynamic advance settings) to bring it up to DI spec. the injection pressure is ofcourse higher than with the IDI pump.

the injector pump on mollins' car is a purpose built pump from www.dieselvw.com to suit the "M-TDI" conversion (mechanically controlled throttle instead of drive by wire, as fitted to the 1st gen TDI's).

this pump is a 1.9 IDI TD pump (as fitted to my mk3 turbo-diesel) with the camplate replaced with a TDI spec camplate.

VW had a far broader technology bridge between IDI and TDI (compared with other manufacturers) - and were selling both kinds of diesel concurrently all over the world for about 6 years (a testimony in itself to the exceptional characteristics of the VW IDI engine). ultimately, VW have gone down the DI path purely for thermodynamic reasons, and nothing else. because of the prechamber in the IDI head, more heat is lost thus reucing efficiency. with DI, ofcourse this is no problem.

it should be noted that differences between the 1st generation TDI's and concurrent IDI's are very few indeed. the 1.9AAZ TD IDI and 1.9 1z TDI share the following engine components

cylinder block
crankshaft
camshaft/valvetrain/valves
all engine ancillaries
turbocharger, manifolds

only the engine management, fuel system, pistons and head casting are different!

Hi all I want to try the following combo and was hoping for a critique

Im going to bolt this turbo onto the 1.5 whilst i build myself a 1.9 IDI turbo block up from scratch

http://www.dieselvw.com/16TurboConversion.htm

wondering if it will handle the 1.9 later on?

Also I want to run the

http://www.dieselvw.com/RebuiltMTDIPump.htm with this head


http://www.dieselvw.com/AAZCompleteHead.htm and these injectors


http://www.dieselvw.com/16TDMercedesInjector.htm


I would be especially interested in any knowledge of how that injector would behave in an IDI head with 155 bar pressure and also what bar the mtdi pump runs at, is it higher than 155 bar


thanks


george

i cant tell you the break pressure of the TDI injectors, but 155bar is generally considered a bit on hte high side for VW IDI setups. 135-140bar seems to be about the upper limit for economy and power.

the turbo kit you have linked to is coming to me in the mail as we speak (my dads getting it) and he'll be bolting it on a 1.5. that turbo is a diesel K03 equivalent - the same turbo that came out factory on 1.9TDI's, so its not badly sized for a 1.9 - very "streetable" turbo, but definately not anything that'll get huge screaming horsepower, purely because its such a good restriction and wont flow too much. i'd guess a 100-110hp limit on a diesel.

i should also point out that all the turbo's sold on that website are chinese made by YEQI under licsense. for a chinese company, they appear (through my research) to be quite good. i've only held one of their turbo's in my hand before, and it looked OK. he offers 12months warranty on all the turbo's sold from there so they cant be time-bombs. but, its good to know what your buying :-). like i said, i've got that turbo kit on order, plus a T3 40 trim from there aswell for my 1.9 :-)

was hoping to use the style of injector for its ability to cope with thicker fuels,


this looks more appropriate

http://www.dieselvw.com/16NAInjector.htm



my five speed, seat cordoba rear brake upgrade and 210 mm clutch/ flywheel and some other toys should be here wed or thurs from camden gti and once that's done I am going to order that turbo kit and get an I/C from fleaybay stay tuned for pics


Its hard to tell with the chinese stuff some of it is quite good


also noted that 1.9 sleeves are available 1.9 is a wet sleeve block ? Was the block ever cast in alloy if it was it would make a wicked A/C engine

ty gldgti

wow mate, your quick off the mark! well done (you wont know yourself with the brake upgrade stuff :-) )

take a look at the thread in the mk1 section "swallowtail goodness" with the build of mollins' mk1 tdi - i've posted some pics of hte intercooler setup that we installed in his car a few weeks back :-)