10.5 comp with 16G

[Diamondrev]

A friend of mine gave me his big 16g turbo. I am currently buying a turbo manifold with the T3 to MHI adapter plate.

My goal is to have a quick street car. its my daily driver and its built. I only want to run 8psi.

I have a few questions...

Will I be ok running 10.5 compression with 8 psi. No tune. 91 pump gas??

Also I have heard that the 16g's internal wastegate is set at 12psi stock. How can I bypass this? I want to run an external wastegate.

I really want to keep this turbo build under 1k.

Thanks in advance...

 

[rstare]

I doubt you'll be able to run that setup without someway of detecting knock and adjusting spark accordingly. Without control of spark, you'll have to dump extra fuel in to avoid knock, which you don't really want to do. My vote is: without some control of spark, don't do it.

 

[Diamondrev]

Dam.

What would you recommend? Megasquirt? Portfueler? S-AFC?

 

[LD25Delta9]

+1

You'll need a higher octane gasoline too. You may be able to weld the wastegate flapper closed, then run an external wastegate.

 

[Boosted_talon98]

Dam.

What would you recommend? Megasquirt? Portfueler? S-AFC?[/QUOTE]


What a joke unless your car won't idle due to oversize injectors mayn..

 

[HadesOmega]

I ran 10.5:1 and a T3/TO4E at 8 psi, you could totally do it, its not a lot of boost. Its pretty awesome too the boost response is good. I was running SAFC and SFMU with 30lb injectors @ 22psi fuel pressure. What are you going to do about smog? I have a huge Accell inline pump also. You'll basically need something to give you more fuel like a SFMU and a bigger pump. You will want an intercooler also.

 

[forcefed86]

If you have e85 in your area you'd be fine with double stock size injectors, 255hp walbro fuel pump, and an SAFC to tune with. You could run as much boost as your internals would hold.

 

[LD25Delta9]

Why do people keep recommending safc? The reworked fuel maps are useless once the FCD or ML sees boost. It'll only run the same fuel map as WOT. I'm still completely stumped as to how people are running safc properly....I guess I understand the how, it's they why....Between sacf and the sfmu, you might as well get Megasquirt. All you need is a 1:1 FPR and what ever size injectors your heart desires.

 

[Tanro]

I would think it would be a terrible idea to run that much boost on 10.5 with no tune. Megasquirt would be the best way to go for you.

Alot of the saturn guys run MS and they are running about 8lbs on average out of garetts and lot more have started using MHI turbos be cause the dsm manifolds are stupid easy to mod to fit the saturn head. That being said they are running 9.5:1 CR on stock internals and most of them go with 8.5:1 forged pistons for any kind of higher boost/hp goals.

If your running boost with that high of a CR and no tune whatsoever your gonna need to run some kind of kind water/meth injection or you really run the risk of destroying your motor due to detonation.

 

[tec_41]

As far as running an external gate goes, you do just weld the internal gate flapper shut.

 

[turbotalon1g]

Why would u want 10.1 and 8psi?

 

[Slo2gen]

Why do people keep recommending safc? The reworked fuel maps are useless once the FCD or ML sees boost. It'll only run the same fuel map as WOT. I'm still completely stumped as to how people are running safc properly....I guess I understand the how, it's they why....Between sacf and the sfmu, you might as well get Megasquirt. All you need is a 1:1 FPR and what ever size injectors your heart desires.

They run the SAFC to be able to idle big injectors by setting -fuel values. They don't just use an SAFC, they use it in conjunction with a rising rate regulator. I think the general consensus is you don't want to go much bigger than 450cc injectors with an SAFC and a rising rate fuel pressure regulator. Hopefully now you understand why people still say SAFC

 

[LD25Delta9]

They run the SAFC to be able to idle big injectors by setting -fuel values. They don't just use an SAFC, they use it in conjunction with a rising rate regulator. I think the general consensus is you don't want to go much bigger than 450cc injectors with an SAFC and a rising rate fuel pressure regulator. Hopefully now you understand why people still say SAFC

I know how it works...thus, the mention of SAFC and an SFMU... when used on a car that has an ecu with more controllable parameters, SAFC is good. My point is though, for a 420a, a new SFMU for $348.00, a new SAFC-neo for $489.00, and a FCD for 50.00 is not cheap. MS2 is $560.00 for the 420a kit, add another $164 for a 1:1 FPR and you save $163.00. Chances are, most people don't know what they're doing when they try to tune. So, you'll still need to pay for that, too. I also didn't include the price of the injectors. Which, once you get into the higher flowing injectors, they all cost about the same. Case in point, for $163.00 cheaper, you can control EVERYTHING and run a WAY better tune than SAFC could ever hope to provide for the 420a. I don't know about you, but if I can come up with all the money to get SAFC and it's related paraphernalia, plus tuning, I'll gladly save 163.00 and do it right. Not to mention, for a basic MS setup, there are plenty of uploaded tunes that are free to download from the MSQ repository.

Let me also point out that I do not have the money for all of this, which is why I don't have any of it. These were also brand new prices pulled from Symtech Products Vortech SFMU and Apexi. Parts can be found used for cheaper on eBay and in certain classifieds. But if you're going to go brand new, which comes with the benefit of warranties with some of the products, then MS2 would be the choice of the wiser. This was all purely for sake of healthy argument.