GrimJack;1174341 said:
In one of the older articles floating, that was surmised by the aftermarket. That the car would run harder stock with out that intercooler. I think it was Cartech that stated it.
Stock IC limit Q's
- Thread starter Pantaloon007
- Start date
In one of the older articles floating, that was surmised by the aftermarket. That the car would run harder stock with out that intercooler. I think it was Cartech that stated it.
Yoda pretty much put the irons to that rumor. Despite the higher pressure, the engine put out less power. Eventually he put in a water powered IC to up the power.
Eventually you'll go outside the efficency range of the turbo and at that point the IC can't keep up and will heatsoak lowering power.
Better turbo, and you'll eventually hit the flow limit of the stock IC.
As is the case with turbo cars, the true answer is always "it depends."
Better turbo, and you'll eventually hit the flow limit of the stock IC.
As is the case with turbo cars, the true answer is always "it depends."
jtran8;1174878 said:
Yeah Im looking to keep it mild for now- under 14psi, ct26 in stock form. Roulghly 300hp @ the wheels. Fast enough to hang with most v8's...So i'll upgrade to 2" pipes from turbo outlet to 3000 pipe. When Im ready to go to the next level- lex AFM, 550's, eManage, WB, 57or60-1 rebuild- then Ill pop for the IC. Most likely after I rebuild the motor and add a MHG.
Thanks for the info fellas
Night and day difference changing out the intercooler for a spearco replica. The upgrade completely smoothed out my power band.
My car made roughly 350Rwhp ....337rhp with the Trans slipping pretty bad on stock pipes and intercooler, I don’t recommend it and it’s the first supra I have had in a while without an upgraded IC.... To me it feels flow restricted in the top end and boost seems to fluctuate more on a given pull.
When I worked at still in found some older Pdf's and a binder of test data when still developed there intercooler kit for a 300zx testing roughly 14 different intercooler cores for flow pressure drop and thermal efficiency, HKS GREDDY APEX SPEARCO GARRETT were all tested .......And it was not even close the Spearco Cores were incredibly better most cases all the way around. Also people from the posts I have read on this thread don’t seem to realize that pressure drop increases with boost, there was a mentioning of 3 psi drop in boost. If I recall that would be at like 12psi and 20psi I would not be surprised if it was more like 5 or 6psi with a huge drop off in cooling efficiency
When I worked at still in found some older Pdf's and a binder of test data when still developed there intercooler kit for a 300zx testing roughly 14 different intercooler cores for flow pressure drop and thermal efficiency, HKS GREDDY APEX SPEARCO GARRETT were all tested .......And it was not even close the Spearco Cores were incredibly better most cases all the way around. Also people from the posts I have read on this thread don’t seem to realize that pressure drop increases with boost, there was a mentioning of 3 psi drop in boost. If I recall that would be at like 12psi and 20psi I would not be surprised if it was more like 5 or 6psi with a huge drop off in cooling efficiency
luckily I have a set of 2.5" and 2" pipes, couplers, and clampsgrimreaper;1175143 said:your going to kick yourself for not getting the 2.5" now if your upgrading later.
Maybe just go to 2.5"'s right away?
While pressure drop does seem a bit high, none of these answers have taken into account that cooler air is less dense, which is why it shows a lower psi at the intake....
Hi guys, new to turbo principles so forgive me if this sounds dumb but, it is my understanding that the air does not change it's density through the intercooler.
Is that correct?
Is that correct?
As I understand it, air does change in density because it changes in temperature. Cool air is more dense than hot air. That is true for any gas.
I thought a 2-3psi drop @ 10-12 psi across an IC is about average, at least thats what Ive read in Maximum Boost. BTW doesnt the stock gauge read boost as it goes into the 3000 pipe? If so it would account for the drop.
Im going to change out my stock pipes with a set of 2.5" and will let you guys know the pressure drop before and after- I was going to just use a compressor, blow it in at the turbo outlet, and block off the pipe at the connection to the 3000 pipe. It seems to me that will give an accurate pressure drop measurement. I guess blowing it in the inlet of the IC and measuring the outlet will do the same, but Im wondering if it isnt the stock piping that causes the restriction.
I thought a 2-3psi drop @ 10-12 psi across an IC is about average, at least thats what Ive read in Maximum Boost. BTW doesnt the stock gauge read boost as it goes into the 3000 pipe? If so it would account for the drop.
Im going to change out my stock pipes with a set of 2.5" and will let you guys know the pressure drop before and after- I was going to just use a compressor, blow it in at the turbo outlet, and block off the pipe at the connection to the 3000 pipe. It seems to me that will give an accurate pressure drop measurement. I guess blowing it in the inlet of the IC and measuring the outlet will do the same, but Im wondering if it isnt the stock piping that causes the restriction.
shiftysupra;1178089 said:
Cooler air is MORE dense.
You'll hit fuel cut with less pressure during the winter because of this.
Pressure drop across the IC is based on the cooling (causing the air to be denser) and flow (if it can't flow enough to keep up), you're not going to have either issue on a stock turbo unless you're going way out of it's range (over 15PSI).
Use your money elsewhere.
Thats what I was wondering- I knew it was a volume(CFM) issue rather than a pressure issueIJ.;1178160 said:
Well now here's the next question- if Im keeping the mods where theyre at now-refer to post #1- will 2" pipes reduce lag as opposed to 2.5" pipes? I figured it would, but then 2.5" pipes would flow easier. Keep in mind that in about 10-12 months from now I'll be going to the next level w/ LexAFM/550's/eManage/WB. Would the difference be negligible?
shiftysupra;1178089 said:
cooler air more dense....:biglaugh:
EDIT - I notice im late to the game
Pantaloon007;1178428 said:
One thing though, your original test plan wouldnt have worked since you were just pressurizing the piping (If I read correct you wanted to block the IC piping off before it enters the 3000 pipe). If you block the pipe off and pressurize it, therefore no flow, there will not be any noticeable amount of pressure drop. The measurements need to be taken while there is pressure and flow.
no it reads off the manifold. there is a nipple on the side of the manifold, near the back of the engine bay that feeds pressure to all the different items that need it, like the boost sensor. based upon this question id guess you dont quite know you way around the motorPantaloon007;1178136 said:
Pantaloon007;1178428 said:
remember though, 2.5 is larger so it will take longer to fill with volume, resulting in a slight lag. and the opposite is true, smaller pipes will flow air quicker but limit the volumetric flow.