est. hp at these boost ranges
Joined: Apr 2004
Posts: 371
Likes: 0
From: It says BIGBOOST
Re: (tyrone27)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tyrone27 »</TD></TR><TR><TD CLASS="quote">and why is it waste of time.</TD></TR></TABLE>
Here's why. I made the actual illustration on the compressor map you've provided with your stats. It's a little rough, but here goes:
Okay...the blue X is a range you should be between. The red X is where you would be with those stats. To get closer to the blue x's location, you'll need to run more boost, and revving higher certainly wouldn't hurt either. If you utilized this turbo in the situation you mentioned, you make power, but certainly not much. BTW, here's the numbers I used:
7200 RPM (which you provided)
108cid (which is what that scirocco measures)
I estimated an 80% V.E. which I'm sure anyone will say was more than fair.
I assumed 77% compressor efficiency.
26in/Hg as a barometric pressure, which is about average at sea level
70* day
I assumed a 2psi pressure drop across the intercooler system so 7psi outlet pressure
5psi manifold pressure
Your set up actually flows ~187CFM and your outlet temps are ~173*F.
Your sealevel corrected suction flow was 44.2 and your pressure ratio is 1.62 . To make this work...long story short, turn the boost up or rev it higher, or both. The green X is where you'd be at 18psig and your current 7200rpm limit which is about perfect for this turbo. Good luck. oohhh, before I forget, that's ~155hp assuming that it takes only 1.2cfm to make 1 hp which is considerably good. At 18psig you'd be making ~193 more hp.
Here's why. I made the actual illustration on the compressor map you've provided with your stats. It's a little rough, but here goes:
Okay...the blue X is a range you should be between. The red X is where you would be with those stats. To get closer to the blue x's location, you'll need to run more boost, and revving higher certainly wouldn't hurt either. If you utilized this turbo in the situation you mentioned, you make power, but certainly not much. BTW, here's the numbers I used:
7200 RPM (which you provided)
108cid (which is what that scirocco measures)
I estimated an 80% V.E. which I'm sure anyone will say was more than fair.
I assumed 77% compressor efficiency.
26in/Hg as a barometric pressure, which is about average at sea level
70* day
I assumed a 2psi pressure drop across the intercooler system so 7psi outlet pressure
5psi manifold pressure
Your set up actually flows ~187CFM and your outlet temps are ~173*F.
Your sealevel corrected suction flow was 44.2 and your pressure ratio is 1.62 . To make this work...long story short, turn the boost up or rev it higher, or both. The green X is where you'd be at 18psig and your current 7200rpm limit which is about perfect for this turbo. Good luck. oohhh, before I forget, that's ~155hp assuming that it takes only 1.2cfm to make 1 hp which is considerably good. At 18psig you'd be making ~193 more hp.
Thread Starter
Honda-Tech Member
Joined: May 2004
Posts: 161
Likes: 0
From: Baltimore, MD, USA
Re: (boosted_dc2)
damn dude. never seen anyone in my life display a map like that. damn. I'm hoping to get teh crx in two weeks and buy the turbo equipment off ebay. i'm going ot put my old t3 60 trim ford t-bird turbo on it at 15psi. I know with tec 2 it should be able to take it. I was told today that I should do a motor swap to a b series motor but I always been a beliver of build whats in the car.
Joined: Apr 2004
Posts: 371
Likes: 0
From: It says BIGBOOST
Re: (boosted_dc2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted_dc2 »</TD></TR><TR><TD CLASS="quote">thats the first time ive seen a honda-tech member actually use and display a comp. map 
</TD></TR></TABLE>
Wow. That, my friend, is dissapointing.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">ive never known how to read one thouroughly, nor how to figure **** out. thats sweet.
Landon</TD></TR></TABLE>
I was going to offer to show you, but then I remembered that there are 2-3 threads already on how to read comp. maps. I just glazed over them, but they seemes to hit all the important ****.
[quote]I'm hoping to get teh crx in two weeks and buy the turbo equipment off ebay. i'm going ot put my old t3 60 trim ford t-bird turbo on it at 15psi.[/quote
Did you rebuild it yet? If not, have fun with the smoke screen.
</TD></TR></TABLE>Wow. That, my friend, is dissapointing.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">ive never known how to read one thouroughly, nor how to figure **** out. thats sweet.
Landon</TD></TR></TABLE>
I was going to offer to show you, but then I remembered that there are 2-3 threads already on how to read comp. maps. I just glazed over them, but they seemes to hit all the important ****.
[quote]I'm hoping to get teh crx in two weeks and buy the turbo equipment off ebay. i'm going ot put my old t3 60 trim ford t-bird turbo on it at 15psi.[/quote
Did you rebuild it yet? If not, have fun with the smoke screen.
Joined: Jan 2003
Posts: 1,273
Likes: 0
From: Manchester, NH, USA
Re: (1316130057)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1316130057 »</TD></TR><TR><TD CLASS="quote">
7200 RPM (which you provided)
108cid (which is what that scirocco measures)
I estimated an 80% V.E. which I'm sure anyone will say was more than fair.
I assumed 77% compressor efficiency.
26in/Hg as a barometric pressure, which is about average at sea level
70* day
I assumed a 2psi pressure drop across the intercooler system so 7psi outlet pressure
5psi manifold pressure
Your set up actually flows ~187CFM and your outlet temps are ~173*F.
Your sealevel corrected suction flow was 44.2 and your pressure ratio is 1.62 . To make this work...long story short, turn the boost up or rev it higher, or both. The green X is where you'd be at 18psig and your current 7200rpm limit which is about perfect for this turbo. Good luck. oohhh, before I forget, that's ~155hp assuming that it takes only 1.2cfm to make 1 hp which is considerably good. At 18psig you'd be making ~193 more hp.
</TD></TR></TABLE>
I just checked these numbers, and they look close enough.
I got a little more airflow, and a little more power (well, were you talking about WHP or CHP?)
assuming 10% drivetrain losses, you're talking in the 150 whp range at 7000 rpm, assuming 80% VE. I think it's likely that your VE is lower than that at 7k though, on an older CRX.
With 7 psi turbo outlet pressure, I don't think he will see a full 2 psi drop through the intercooler. Probably more like 1 psi.
I also got more like 190 CFM.
Regardless, both of us are telling the same story.
7200 RPM (which you provided)
108cid (which is what that scirocco measures)
I estimated an 80% V.E. which I'm sure anyone will say was more than fair.
I assumed 77% compressor efficiency.
26in/Hg as a barometric pressure, which is about average at sea level
70* day
I assumed a 2psi pressure drop across the intercooler system so 7psi outlet pressure
5psi manifold pressure
Your set up actually flows ~187CFM and your outlet temps are ~173*F.
Your sealevel corrected suction flow was 44.2 and your pressure ratio is 1.62 . To make this work...long story short, turn the boost up or rev it higher, or both. The green X is where you'd be at 18psig and your current 7200rpm limit which is about perfect for this turbo. Good luck. oohhh, before I forget, that's ~155hp assuming that it takes only 1.2cfm to make 1 hp which is considerably good. At 18psig you'd be making ~193 more hp.
</TD></TR></TABLE>
I just checked these numbers, and they look close enough.
I got a little more airflow, and a little more power (well, were you talking about WHP or CHP?)
assuming 10% drivetrain losses, you're talking in the 150 whp range at 7000 rpm, assuming 80% VE. I think it's likely that your VE is lower than that at 7k though, on an older CRX.
With 7 psi turbo outlet pressure, I don't think he will see a full 2 psi drop through the intercooler. Probably more like 1 psi.
I also got more like 190 CFM.
Regardless, both of us are telling the same story.
Joined: Apr 2004
Posts: 371
Likes: 0
From: It says BIGBOOST
Re: (kpt4321)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kpt4321 »</TD></TR><TR><TD CLASS="quote">
I just checked these numbers, and they look close enough.
I got a little more airflow, and a little more power (well, were you talking about WHP or CHP?)
assuming 10% drivetrain losses, you're talking in the 150 whp range at 7000 rpm, assuming 80% VE. I think it's likely that your VE is lower than that at 7k though, on an older CRX.
With 7 psi turbo outlet pressure, I don't think he will see a full 2 psi drop through the intercooler. Probably more like 1 psi.
I also got more like 190 CFM.
Regardless, both of us are telling the same story.</TD></TR></TABLE>
I was using CHP. Anyone's numbers will be different depending on what conversion they use from lbs/min to CFM and how much CFM they decide it takes to make 1hp. I used the 80% V.E. to try to tilt the numbers a bit in his favor. It's probably off by no more than 5%. And with such low boost and the amount of piping it'll take and a Starion IC on top of all that, he'd definitely see a 2psi drop, 1 from the IC and another from the decompression that's going to happen in the piping.
But, at the end of the day, you're right. We are telling the same story. The differences would be slim to none.
I just checked these numbers, and they look close enough.
I got a little more airflow, and a little more power (well, were you talking about WHP or CHP?)
assuming 10% drivetrain losses, you're talking in the 150 whp range at 7000 rpm, assuming 80% VE. I think it's likely that your VE is lower than that at 7k though, on an older CRX.
With 7 psi turbo outlet pressure, I don't think he will see a full 2 psi drop through the intercooler. Probably more like 1 psi.
I also got more like 190 CFM.
Regardless, both of us are telling the same story.</TD></TR></TABLE>
I was using CHP. Anyone's numbers will be different depending on what conversion they use from lbs/min to CFM and how much CFM they decide it takes to make 1hp. I used the 80% V.E. to try to tilt the numbers a bit in his favor. It's probably off by no more than 5%. And with such low boost and the amount of piping it'll take and a Starion IC on top of all that, he'd definitely see a 2psi drop, 1 from the IC and another from the decompression that's going to happen in the piping.
But, at the end of the day, you're right. We are telling the same story. The differences would be slim to none.
Joined: Jan 2003
Posts: 1,273
Likes: 0
From: Manchester, NH, USA
Re: (1316130057)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1316130057 »</TD></TR><TR><TD CLASS="quote">
And with such low boost and the amount of piping it'll take and a Starion IC on top of all that, he'd definitely see a 2psi drop, 1 from the IC and another from the decompression that's going to happen in the piping.
</TD></TR></TABLE>
I disagree. I don't quite see 2 psi of pressure drop, at 18 psi through a DSM SMIC (smaller core than a starion) and probably about the same amount of IC piping.
Still, pressure drop doesn't make a huge difference.
And with such low boost and the amount of piping it'll take and a Starion IC on top of all that, he'd definitely see a 2psi drop, 1 from the IC and another from the decompression that's going to happen in the piping.
</TD></TR></TABLE>
I disagree. I don't quite see 2 psi of pressure drop, at 18 psi through a DSM SMIC (smaller core than a starion) and probably about the same amount of IC piping.
Still, pressure drop doesn't make a huge difference.
Joined: Apr 2004
Posts: 371
Likes: 0
From: It says BIGBOOST
Re: (kpt4321)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kpt4321 »</TD></TR><TR><TD CLASS="quote">
I disagree. I don't quite see 2 psi of pressure drop, at 18 psi through a DSM SMIC (smaller core than a starion) and probably about the same amount of IC piping.
Still, pressure drop doesn't make a huge difference.</TD></TR></TABLE>
I dunno. I still see at least a 1psi drop across the piping and another 1 after the IC is done diffusing the charge. Unless the piping were 2" or smaller.
I disagree. I don't quite see 2 psi of pressure drop, at 18 psi through a DSM SMIC (smaller core than a starion) and probably about the same amount of IC piping.
Still, pressure drop doesn't make a huge difference.</TD></TR></TABLE>
I dunno. I still see at least a 1psi drop across the piping and another 1 after the IC is done diffusing the charge. Unless the piping were 2" or smaller.
Thread
Thread Starter
Forum
Replies
Last Post
thermostate82
Honda Prelude
11
Jan 1, 2009 10:46 PM