914 1.8 Turbo Setup, Questions On a Turbo Setup Options

[modpr2]

I am looking to turbocharge my 75 914 1.8 and need some help. Ive been researching a Megasquirt 2 system and would like to use it to control my fuel injection and ignition timing on my car. I was wondering if i could use my stock F.I. system as my base, so my first question is if anyone has a diagram of the fuel injection system on a 1.8 914. im trying to see what i need to add and what i can delete to work with a turbo. i have alot more questions but ill stick with one at a time to give me time to research and use the wonderful search button. thanks for the help.

[Brando]

I don't really have a diagram or layout in image form I can post to help you, but since you are using the MS2 setup I would reccommend using the Mega Jolt system or something of the like with a boost retard as well.

[sportlicherFahrer]

thought you couldn't turbo a 914! (IMG:style_emoticons/default/biggrin.gif)

[Mueller]

I am looking to turbocharge my 75 914 1.8 and need some help. Ive been researching a Megasquirt 2 system and would like to use it to control my fuel injection and ignition timing on my car. I was wondering if i could use my stock F.I. system as my base, so my first question is if anyone has a diagram of the fuel injection system on a 1.8 914. im trying to see what i need to add and what i can delete to work with a turbo. i have alot more questions but ill stick with one at a time to give me time to research and use the wonderful search button. thanks for the help.

KEEP:
intake plenum
throttle body
intake runners
fuel injectors (I'd send them out to be professionally tested)
CHT (a new one wouldn't be a bad idea)

TOSS:
TPS (get a more modern pot. style one)
Air temp sensor (get a new seperate one)

[modpr2]

KEEP:
intake plenum
throttle body
intake runners
fuel injectors (I'd send them out to be professionally tested)
CHT (a new one wouldn't be a bad idea)

TOSS:
TPS (get a more modern pot. style one)
Air temp sensor (get a new seperate one)
[/quote]

What is a CHT? Also i need to use a MAP sensor where would i mount that, anywhere inside the plenum or does it have to be in a certain spot.

[modpr2]

If add stronger rod bolts how much hp can a rebuilt stock 1.8 engine handle 160, 180, 200 hp or is that asking way too much.

[Mueller]

Cylinder Head Temperature sensor, used mostly for warmup

the bottom end of the type IV is supposed to be pretty stout....I'd ask on shoptalkf forums about the 1.8 rod strength, but I wouldn't be worried about at any of those levels...

[modpr2]

Cylinder Head Temperature sensor, used mostly for warmup

the bottom end of the type IV is supposed to be pretty stout....I'd ask on shoptalkf forums about the 1.8 rod strength, but I wouldn't be worried about at any of those levels...

great news I think that 200 hp would be more than enough hp for my 914.

[Mueller]

it is not the HP that kills the motors, it's keeping them cool enough that is the challange...

[Sammy]

the rerquired strength of rod bolts has absaolutely nothing to do with HP or turbocharging. It is a function of rotational and reciprocating weight and RPM.
If you are planning to spin the engine significantly faster than redline or adding mass to the pistons or rods, you may need to strengthen the rods. Of those two, the speed makes a much larger difference than mass (f=m*V squared)

[Sammy]

To get 200 hp out of a 1.8 without a great deal of very expensive head modifications, you would have to run close to 1 bar of boost. that would require very efficient intercooling, good oil cooling, possibly some increase in cooling air to the heads, and still that might not be enough.
I'd venture to say you would also need at least 95 octane to pull that off even when running rich and backing off the timing.
200 hp is really pushing it with a 1.8 with stock heads.
I aint saying it can't be done, I'm just saying it will be very challenging and expensive.

On my stock 2 liter I was running 7 psi boost and getting somewhere between 150 and 175 hp which felt like a 500.

[modpr2]

To get 200 hp out of a 1.8 without a great deal of very expensive head modifications, you would have to run close to 1 bar of boost. that would require very efficient intercooling, good oil cooling, possibly some increase in cooling air to the heads, and still that might not be enough.
I'd venture to say you would also need at least 95 octane to pull that off even when running rich and backing off the timing.
200 hp is really pushing it with a 1.8 with stock heads.
I aint saying it can't be done, I'm just saying it will be very challenging and expensive.

On my stock 2 liter I was running 7 psi boost and getting somewhere between 150 and 175 hp which felt like a 500.

I plan on running an intercooler, i was going to mount one in the trunk or a smaller one in the engine compartment but i cant run 95 octanei will only be running 91 octane. could i run at 160 hp until i can put larger valves and port and polish the head or is that going to heat up the engine to much.

[Mueller]

I'd look into some 2.0 heads or twin-plugging the 1.8 heads (IMG:style_emoticons/default/smash.gif)

[modpr2]

I'd look into some 2.0 heads or twin-plugging the 1.8 heads (IMG:style_emoticons/default/smash.gif)

what does it take to twin plug the 1.8 heads.

[G e o r g e]

I'd look into some 2.0 heads or twin-plugging the 1.8 heads (IMG:style_emoticons/default/smash.gif)

what does it take to twin plug the 1.8 heads.

$$$$$$$$$$$$$$$$



and a call to HAM

[Mueller]

I'd look into some 2.0 heads or twin-plugging the 1.8 heads (IMG:style_emoticons/default/smash.gif)

what does it take to twin plug the 1.8 heads.

twin plug heads

I would think the megasquirt could easily handle this if one goes crankfire

[modpr2]

I'd look into some 2.0 heads or twin-plugging the 1.8 heads (IMG:style_emoticons/default/smash.gif)

what does it take to twin plug the 1.8 heads.

twin plug heads

I would think the megasquirt could easily handle this if one goes crankfire

as much as i would like to try that i would go with the 2.0 heads before trying that. but it is a good idea but out of my skill level and like said in the thread probably not worth the hp to cost ratio.

[Mueller]

as much as i would like to try that i would go with the 2.0 heads before trying that. but it is a good idea but out of my skill level and like said in the thread probably not worth the hp to cost ratio.

considering that 2.0 heads offer up to a 10% increase over 1.7/1.8 heads and that is mostly due to sparkplug location, I'd say it's worth doing...I guess it comes down to how much money one would have to spend...not something you'd want to try at home with just a handheld drill (IMG:style_emoticons/default/blink.gif)

I need to back to working on my 1.8 turbo project, I have not touched it since I got the reducer from the header to the turbo

[Sammy]

When turbocharging an engine, the first rule is to do your homework. Study, read.

Second is to design the system for a purpose. An arbitrary HP rating is not a purpose.
Third is to start small, take baby steps. Start with 3 or 4 psi boost. Check everythnig like EGTs, A/F ratios, etc.
Then bump it up one or two PSI and check everything again.
After a bunch of checking and tweeking and measuring you may hit your mark, or you may stop short for safety reasons, or you may melt parts because you got greedy and took a shortcut.

I had my 2 liter up to 11 psi for a little while, I ended up backing it down to save the motor. I felt it just wouldn't be able to take that much pressure and heat for the long term and stay together.

My 911SC is happy at 8 psi but I usually keep it at 6 psi unless I want to really get after it. I could go higher and impress the heck out of the dyno guy but parts are expensive. I put this engine together to last at least 20 years.

[modpr2]

yeah that is true its not worth destroying the motor. my goal is just to get some more power to my car and have fun doing it. i thought a turbo project would be fun and a learning experience. did you tune your cars yourself and did you use a dyno or did you street tune them.