Yes I did search, and found some close ideas but I was hoping for something more concrete, how much boost before the stock TMIC no longer is useful? Thanks.

Ben

 

from everything I've seen I'd say around 11-12 pounds it starts to reach a plateau it it's effeciency range

Matt

 

Define "not useful"...

10psi is the consensus.&nbsp You can go more, but the boost period is shortened.&nbsp I've been running it up to 14psi myself without any observable problems; you can't run it at this kinda boost more than 10-15 seconds before the EGT's start going through the roof.



-Ted

 

If you fuel ratio is fine ... whats is the consenquenses of high EGT's or prolonged high PSI boost? and how much will a good FMIC cut down on that?

 

It'll detonate...

Dependent on IC efficiency...


-Ted

 

thanks ted, much obliged, will keep boost controller at ten till FMIC is bought, I know it will creep will bring it higher but at least not for long periods. thanks again.

ben

 

why not front mount your stocker and try that first.. You only have to buy the piping and fittings.

How much better does it work up front?

Any percentages of effeciency gained?

I seen one guy running low 12s with the stock unit up front. Not sure how much boost and not sure about the turbo either. I think he said the turbo was stock.

 

Really? More than ~12PSI is bad, bad, bad for the stock I/C?

This puts a rumple in my one bar plans, heh.

 

yeah I'd like to know that also.. is the stock better as a front mount?

I'm guessing the top mount isn't very good, I've heard anything from yeah it works fine to it doesn't flow much (if any) air through it.

Speaking of which, if I were to buy a fan and put it on, would it help much? And if so, which way should I make the air flow (I've also heard people SWEAR that air actually flows from in the engine bay through the intercooler and out the hood)

 

Yes, I have seen the heat rise out the scoop also.


I think a fan would be a waste for the top- mount setup. No room to mount the fan.

I think personally moving the intercooler up front with increase the intercooler capacity too cool up about 25 to 50% better.

 

The heat would disipate away from the intercooler faster if it was mounted in the front, also the flow of air going through the intercooler would cool a lot better.

 

might give that a shot, have to see

 

yeah it's not a bad idea.. I know a guy who'll weld me some pipe up pretty cheap, can probably get 2.5" mandrel bent piping for a FMIC made for around $100.

 

Anyone know if a front mounted Mitubishi Starion intercooler will cool better than a front mounted T2 intercooler? I need to find an inexpensive intercooler for my 13bt datsun 510 swap.

thanks
John

 

Thats the same one as the one Scott used on his car. Ya its an improvement on the stock one definitely.

 

I heard the starion sucked as far as pressure drop (not pressure drop due to cooling, but pressure drop due to restriction)

 

The problem there is no information any more concrete than what you have already read. There is no single psi after which your intercooler does not work. It all depends on your car, ambient temp, your mods, etc.

RotaryTurbo, aka Ben Marr, was pushing 18 psi through the stock top mount with a hybrid 60-1 turbo. He was running low 12s consistantly, with a best of 11.9 in the 1/4 mile.

As you can see, the stock top mount is fine for short runs.


see ya,
Kris

 

uh, you sure? low 12s with a stock turbo and stock intercooler? I find that hard to believe.

 

BDC was running 14psi (1 bar)with a 60-1 also using the stock I/C,but did some custom fabrication and had it work as an Air-to-Water intercooler...with a water jacket around it..

 

Here is some 'concrete' information that might be useful. I quote that because it's internet research so who knows...

http://www.autospeed.com/A_0901/page...rc=suggestions

W

 

interesting according to their tests the s4 IC is better than the s5 IC.

 

ReTed, you said that it'll detonate if the A/F ratio is fine. How so? If you have plenty of fuel wouldnt it be fine? Im not saying you can run 16PSI on the stock intercooler and still be making good power, just, how can it detonate with enough fuel? Thanks

 

I was thinking of getting a saab fmic. Its about 12x14 and 2.5in thick. Looks a lot better than our stockers. Anyone have any stats on those puppies?

 

that **** is way too big for stock turbo from what i hear. like 7PSI loss or some ****, i dont know for a fact though

 

Sky-high inlet temps. The mixture will preignite from the compression. The heat energy alone ignites the air/fuel, instead of using the spark as the source of activation energy.

Higher inlet temps lower the activation energy for the combustion reaction.

I have done another idea to help out my stock IC when I need it.

I plumbed my Nitrous system purge valve to a spary bar under my intercooler. At the push of a button I can fog nitrous at -127oF through my intercooler and out the hood scoop. I also designed a simple chip, operated off a switch, to cycle the system on and off every 5 seconds (on for one second) when I crank up the boost for hard runs.

I believe it is cold enough by the formation of frost in the IC fins...