Wich things to do to turbo 2l 914 injection

Hollandbugpower · Post by **Hollandbugpower** » Sat May 10, 2003 10:54 am

I've read a lot of things in this forum about turboing a bug
Í have a 914 2l injection in my possesion, and here is my question,

Can I use the stock injection of a 914 2l for turboing my bug, with a few adjustments of course?

I have the book Maximum boost by corky bel and I've read it, but I still don't know exactly what adjustments to make, to make the injection work. I know about the fuel pressure regulater and the ignition but thats it. I want to know what else i need to do to my injection in my bug.

Can you advise me what I should do?

greetz from Holland

914rrr · Post by **914rrr** » Mon May 12, 2003 7:52 pm

Turbo-ing a d-jet 2.0 can be done, but will take a lot of work.To the best of my knowledge, there are only 2 (running) 914's with d-jet (stock) fuel injection and a turbo. I own a 2.0 d-jet 914 w/ turbo (that was installed by the PO in the 70's) and have been reading & surfing extensively to learn more about 914's w/ turbos and turbos in general. In addition to the obvious things like fabricating the exhaust and intake plumbing, finding a properly sized turbo & wastegate you will need a rising rate fuel pressure regulator, a modification to the Manifold Pressure Sensor (to avoid destoying the innards of the MPS during boost), a BOV and an aux. oil cooler. It probably would help if you added a pressure activated "hobbs" switch wired to the cold start valve for extra fuel / enrichment under boost and /or an alcohol & water injection system. Substituting lower compression bus pistons would also help. Everthing else could stay stock unles you get want to get really crazy with boost.

5-7 psi seems to be a safe amount of boost, although the other d-jet guy pushed his to 13+ pounds of boost (with stock injectors!). Mine is currently running 5 psi of boost, and it is a gas to drive! Power (torque) is more like a 911 than a 914!

While it is best to mount the turbo up in the engine compartment for turbo oil drainage, be sure to wrap the turbo and pipes with (proper) heat barrier material.

2 other people have turbo'ed 914's using CIS injection, while some others are using a side draft weber carb in a "pull thru" set up. Carb may be the easiest route, while the CIS may be a superior setup. One problem with d-jet injection is that parts are becoming scarce and/or rediculously expensive (like $450 to $1000 for a MPS!! Yes, the decimal is in the right place!) Some others have talked about using programmable fuel injection w/ a 914 turbo. This would probably be the BEST route but I haven't heard of any that have actually been built.

There are many threads on Pelican Parts' 914 forum dealing with turbo 914's. Also, dune-buggy.com has a great turbo section.

Rob

Hollandbugpower · Post by **Hollandbugpower** » Tue May 13, 2003 7:42 am

Thanks alot for the info, i was thinking about using the stock injection. But i heard about using saab 900 turbo injection. Is this a good solution for turboing a 914.

And if i want to go serious tuning lets say 15 psi wat things must i do to achieve this rate of pressure.

gr and thanks from Holland

914rrr · Post by **914rrr** » Tue May 13, 2003 7:52 pm

I'm not familiar with the Saab injection system, so I couldn't say if it would work. There might be something about it on the dune-buggy.com site. Stock d-jet injection may work at higher boost levels, but you'd probably need higher flow injectors, higher capacity fuel pump, lower compression pistons, boost retard/anti-knock module, intercooler, >93 octane race gas, higher output ignition (permatune or other), fuel enrichment (either fuel or water/alky or both) , etc. You'd probably need to beef up the bottom end (crank, rods, etc.) as well. I think that the CIS injected 914 turbo guys run boost higher than 10 psi with race gas. Do a search on the Pelican Parts 914 forum for turbo and you will find many 914 turbo threads.

One thing I forgot to mention on the previous post, you definitely want to run one heat range colder spark plugs and tighten up the plug gap, even for modest boost.

Rob

Guest · Post by **Guest** » Wed May 14, 2003 3:36 am

Thanks alot for the info.

About the race gas, in Europe we drive with unleaded 98 fuel is this similar to race gas??

In the engine, what do i have to change exactly to can drive with that boost?

And for the pistons the porsche has stock a cr 8:1 isn't, (i don't know for sure) can't i use the stock piston anymore then, can't the handle 10-15 psi of boost

I appreciate it alot that you are able to help me

greetz from holland

FredZ · Post by **FredZ** » Wed May 14, 2003 2:44 pm

Keep me informed mate. I want to do the same. ( with a 914 and a 2? l engine )

Greets from Holland

jonas_linder · Post by **jonas_linder** » Wed May 14, 2003 2:56 pm

A friend of mine is running saab 900 injection (lucas) on his type4 2.0L (basically the same engine) it puts out 152 hk on the rearwheels. It has about 14-15 psi of overpressure!

Hollandbugpower · Post by **Hollandbugpower** » Wed May 14, 2003 10:22 pm

jonas, that sounds great, can i contact the person you're referring to, or do you know the in and outs of the saab injection

gr from holland

jonas_linder · Post by **jonas_linder** » Thu May 15, 2003 2:16 am

I know the most of it !

It shouldn't be a problem, it has been discussed on the fuel injection forum.

If you got any question about it just ask (I have had an engine running with this system too).

You can use either the LHsystem(bosch) or the lucas.

You can find them on any saab900 16valves turbo or any saab9000turbo older than -89 i think.

Get the whole harness and you should be good to go!

ps. not vwrelated but me and my friend has turboed his volvo and we used LH2.2 for this projekt, works great! ds.

Hollandbugpower · Post by **Hollandbugpower** » Thu May 15, 2003 4:46 am

thanks alot sounds good to me, i think i will use the stock manifolds, is that a good idea, en then bolt the saab 900 injection on it with a few adjustments.

I can buy the 914 engine with and without injection, do i need parts from the 914 injection other than the manifolds

And i live in europe, do you know the prices of the complete injection systeem from saab.

Is the saab up to 15 psi or do i need to modify then, i've heard that saab uses low compression turbo's, so can i bolt the turbo right on?

Hollandbugpower · Post by **Hollandbugpower** » Thu May 15, 2003 4:54 am

have you got pictures of youre setup, i would love to see them, and wich adjustments youre pal make in the engine, cam, pistons etc etc?

greetz from holland

Hollandbugpower · Post by **Hollandbugpower** » Thu May 15, 2003 8:23 am

FredZ wrote:Keep me informed mate. I want to do the same. ( with a 914 and a 2? l engine )

Greets from Holland

he fred waar kom je vandaan? In english is that: he fred were do you come from

gr Ron

jonas_linder · Post by **jonas_linder** » Thu May 15, 2003 10:42 am

Hollandbugpower wrote:thanks alot sounds good to me, i think i will use the stock manifolds, is that a good idea, en then bolt the saab 900 injection on it with a few adjustments.

I can buy the 914 engine with and without injection, do i need parts from the 914 injection other than the manifolds

And i live in europe, do you know the prices of the complete injection systeem from saab.

Is the saab up to 15 psi or do i need to modify then, i've heard that saab uses low compression turbo's, so can i bolt the turbo right on?

I'm building my turboengine right now so I can't show you any pics of mine!

I will also use the stock intake plenum and runners. The saab injectors fits right on but you have to make a new fuelrail(the old saabrail is not made of aluminium or iron so you have to solder them if you want to shorten it).

I don't know about the 914injection but keep the headtempsensor, this could be used directly with the LH.

The price of the system is very spread, I got mine for free but I would not pay more then $40-$70 for it.

The LH should be good for 15 psi if you get it from a turbocar.

But here is a pic of mine friends 2L turboengine ( sorry it is big ):
It's all stock but the camshaft with 270 Duration and a type1 fanshroud.

Hollandbugpower · Post by **Hollandbugpower** » Thu May 15, 2003 11:05 am

jonas jonas, you're helping me to much, thanks for your time, again a lot of help from you,

is the cam the only thing he changed? and than that power out of a stock type 4 with 67 hp, thats awsom, you said he had 150 hp, thats more than the double.

so my 2l 914 engine with about 100 hp will make about 200 hp or am i wrong?

and a question about the intercooler, is that a good spot? on that place is no airstream or is that a good place.

thanks

jonas_linder · Post by **jonas_linder** » Thu May 15, 2003 12:24 pm

Hollandbugpower wrote:jonas jonas, you're helping me to much, thanks for your time, again a lot of help from you,

is the cam the only thing he changed? and than that power out of a stock type 4 with 67 hp, thats awsom, you said he had 150 hp, thats more than the double.

so my 2l 914 engine with about 100 hp will make about 200 hp or am i wrong?

and a question about the intercooler, is that a good spot? on that place is no airstream or is that a good place.

thanks

You can never get to much help :)

He changed some more minor stuff but that is the big change.

I dunno about the hp figure but count low and you will be happy !

The Intercooler is almost ideal placed because of the shape of the body(correct me if I'm wrong).

Good luck building, Jonas Linder

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