BIS turbo...

[Mics126]

i know you joking but there would never be enough flow for a twin turbo. i'm running a aircooled 650 with a garret t2, i'm still trying to sort out my fueling but with the standard carb it did boost a little.
i'm crrently trying to sort out a injection system.

good luck with your project, one bit of advise do reaserch on mounting the turbo you will find that important if your turbo is of a disent size.

[poxxxy]

Hi guys .

I've been collecting as much info in RHF/RHB turbos as possible and I ended up winning an auction for a Daihatsu IHI RHF VQ38 (turbine housing AR of 7) turbo... I don't think this is a ball bearing turbo which would of been the ideal and lots of the awesome looking daihatsu 12v 3 cylinder 660cc motors are running. Kei cars limited in power to about 63-64bhp by regulations capable of alot more! Madness that I quite enjoy the thought of playing with. There is also the VG7 trim from a honda life would of been a good option to I feel... they are both ball bearing options. As is perhaps the VQ50 from a daihatsu copen... cost about £500 to get one imported I imagine . We will see how much I get stung on postage fees on this one first! At the moment its cost me:

(Unit Price x Quantity of Items) + Buyee Service Fee + Payment Fee)
(3,000 yen ×1 item(s)) + 500 yen + 200 yen

I expect the postage is going to sky rocket 30-40k yen perhaps which will really p me off . lol.

The VQ38 seems to be used on the EF-RL engine in a "Daihatsu L602 Move" and also a Terios 4*4 diesel... The scheme of things tends to suggest the diesels cars ran a higher turbine housing AR. Garrett states that this moves the power further up into higher RPM band and tends to suit larger displacements... most Diesel turbo variants seem to have a higher AR. I guess they do need more air than a petrol car to reach Stoich though.

I ended up looking at Fiat 1.4 t-jet turbos, in particular the 120bhp variant I feel should be a good match for the desired pressure of 19.2psi (VL37/possibly VL39 - higher flow for euro 5 emissions perhaps, although still not totally sure on the variances). Another option is an MGT1238SZ which i've not managed to locate, I believe this could be an awesome variety. The other 1.4 spec turbos won't spool up and provide the required boost in the kind of RPM range our little cars operate within however those T-jets can be turned into fire spitting monsters with a good turbo setup! An interesting read here and one of the only places I found compressor maps for any of the RHF3 turbos: www.ingas-eu.org/docs/741.doc. Using the spreadsheet referenced in an earlier thread you can see what kind of air flow these turbo's are suited for when plugging in the specs on the 1368cc cylinder t-jet.

I ended up buying one from ebay.it for £180 used but looking quite clean... I might also have another on the cards but I need to stop spending this cash I need to find first .

A delay in the whole scheme of things is the fact that I bought a 3-1 welder to make up an exhaust firstly, however I need to become familiar with the circuits and start diagnosing whats happening there... the size of the caps in there are a little scary! Hopefully I can get that up and running so I can start fabricating something .

As for twin turbo... I think there are turbos small enough if you can find them. Aisin AMT30, Mitsubishi TD015, Borg Warner KP31... they look like they'd all make awesome twin turbos... used on small 1 litre diesels .

[poxxxy]

Well one of the turbo's arrived today from ebay.it, however i'm not too happy... I opened the box to find the turbo had been split in two, there is a locating roll pin missing from in between the housings, the v-band clamp is also missing. Along with about 4 exhaust downpipe mounting studs .

The bracket for the wastegate actuator has also been broke off the exhaust housing side and left on the actuator rod (which should have been removed by a circlip)... otherwise the collector is a little big than i'd planned for originally but should fit a couple of 1.25" pipes in somehow .

I have a feeling I might end up losing my boot perhaps, but we will see. Obstacles to be overcome... plenty of them!

Anyway here's some pics of the turbo:



















I was expecting it to come whole so not sure where I stand as I don't fancy the cost of sending it back to Italy!

The one from Japan actually arrived in the UK the day after they posted it in Tokyo, however Parcelforce still have it in customs... typical!

[Gadge]

Oh dear can you get in touch with the seller and express your concerns? Perhaps get a refund?

[poxxxy]

I've explained my issues with it, they offered a refund if I sent it back to Italy but £80 through royal mail kind of puts me off! Asked for a partial refund to help cover the cost of a v-band clamp + studs. Will have to weld up the actuator bracket for repair .

[poxxxy]

Finally managed to acquire enough tools to get going with the project . Now I just have to figure out where the hell to route the pipes and place the turbo!

I kind of need to figure out how i'm going to introduce some kind of ignition advance retard with the mechanical dizzy now... or decide on going EFI . That might help me a little!

I spent yesterday cutting some oblique pieces out of some 304 stainless and deburring them... certainly took a while but will be able to make some bends of my own where mandrels or elbows might not be possible. Do I sacrifice boost space and have the turbo sitting above... or try and fit it somewhere down below a little close to the road! They certainly made it awkward with the BIS and wanting more useable space with a boot! I can't help feel but the air cooled would be much easier when it comes to space .

[Scarlettkitten]

Fantastic, nice to see you're soldiering on with this, personally I'd fit the turbo above the engine and make a new engine lit to fit after.

[Mics126]

the a/c engine is alot easier to find space for the turbo. i would probably put it above the engine because you don't realy want water to splash on a hot turbo and cuase posible cracking or worse, but i would try to get sme good cooling for the boot space or it might get a bit hot

[poxxxy]

Haven't got round to fabricating anything yet, still stuck on the fueling/ignition decisions!

[Mics126]

i have managed to use efi but i used the injection off my manta gte which is a very basic efi system. carbs are simple but you would probably have to us a su hif type carb or you would have to modify the carb and fuel system to be able to work with boost.