y2khawk

iTrader: (5)

[quote]Originally posted by TurboBob:
<strong>Suck-thru MAF for now.... (just say no....)
</strong><hr></blockquote>

is that a hint?? <img src="images/icons/grin.gif" border="0">

XLR8NSS

iTrader: (4)

[quote]Originally posted by y2khawk:
<strong>

is that a hint?? <img src="images/icons/grin.gif" border="0"> </strong><hr></blockquote>

OK, whats the deal! <img src="images/icons/confused.gif" border="0">

What do you guys know about pull-thru and blow-thru MAF setups? Pros and cons? Why do pull-thrus "Suck" <img src="images/icons/smile.gif" border="0">

Start a new topic on it please. My topics never get more than a couple of replies. <img src="images/icons/wink.gif" border="0">

Thanks

XLR8NSS <img src="graemlins/gr_chug.gif" border="0" alt="[chug]" />

y2khawk

iTrader: (5)

LOL

i have a handful of bits and pieces that i'm welding up for bob, that's all. Just wondering if he's trying to hurry me up <img src="images/icons/smile.gif" border="0">

although, his setup does some "interesting" things with the pull through. Care to explain bob? <img src="images/icons/grin.gif" border="0">

TurboBob

iTrader: (1)

Well, my suck-thru system drives ok under most circumstances. The issue is dropping the throttle
after the turbo spins up a little. all that compressed volume of air stored up in the intercooler and piping has to go somewhere.... so is goes out thru the turbo :fluttering noise: and the MAF. These new-fangled GM MAF's read air **BETTER** in reverse so the result is a large rich spike. At lower vehicle speeds the engine flames out. I have learned to drive with it but it still frustrates me. My wife has stalled it in traffic several times (you guys know the look....).

Blow thru is the answer. no more rich spike when dumping the throttle. I also have a turbo talon blow-off valve for Harlan to weld next (I have the flange...)

Some may say to use a blow-off valve, but on a MAF setup you would have driveability issues if venting it to atmosphere, and piping it back into the MAF plumbing does not eliminate the rich spike (although it may shorten it)

Harlan: not really a prod, but I have a couple of LP31's I'll swap you for some sparks.

TB

<img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />

[ December 08, 2001: Message edited by: TurboBob ]</p>

just me

draw through vortech here.
10psi and no reversion problem on throttle close at high boost.
If the blow off valve loops from the pressure side to the suction side after the maf there are 0 problems.
Now I also ran this exact system with 15psi on a vr4 blown 5.0 and had no reversion problems but used a race blow off valve to handle the higher cfm.

Steve

TurboBob

iTrader: (1)

I suppose a bypass valve plumbed back before the turbo would help, there would still be a rich spike, but it would be very short and probably not kill the motor.

You running a cooler?

Also, I don't think the ford MAF's sense reverse airflow like ours....

TB

CHRISPY

11.47@124.29mph with a 1.76 sixty.
Stock motor
5#'s boost
Powerdyne blower
3.73 gears
headers, exhaust, clutch etc
Thanks,
Chris

cablebandit

iTrader: (37)

I need to update mine again...still slowest tho but I'm working on it! 11.961 at 119.88 on a 1.928 60' all else is the same

Black LS1 T/A

[quote]Originally posted by cablebandit:
<strong>I need to update mine again...still slowest tho but I'm working on it! 11.961 at 119.88 on a 1.928 60' all else is the same</strong><hr></blockquote>

Two MPH faster is nothing to sneeze at! <img src="images/icons/smile.gif" border="0">

Black LS1 T/A

[quote]Originally posted by Chris ARE 360:
<strong>11.47@124.29mph with a 1.76 sixty.
Stock motor
5#'s boost
Powerdyne blower
3.73 gears
headers, exhaust, clutch etc
Thanks,
Chris</strong><hr></blockquote>

Yaayyyy! Chris!

Sorry for the cheerleading, ya'll... Chris is one of the LS1 Forced Induction pioneers to me. <img src="images/icons/smile.gif" border="0"> He's one of the first guys I saw getting bombarded with questions about making Supercharging work!

Black LS1 T/A

You guys not running Turbos... let us know if you have headers! That's good to know since it impacts performance dramatically!

just me

[quote]I suppose a bypass valve plumbed back before the turbo would help, there would still be a rich spike, but it would be very short and probably not kill the motor.
You running a cooler?

Also, I don't think the ford MAF's sense reverse airflow like ours....

TB

<hr></blockquote>
I use no intercooler of any sort.
I use a custom water/alcohol system I made which totally keeps detonation away and also cools boost charge temps around 100 degrees.

Steve

Black LS1 T/A

[quote]Originally posted by just me:
<strong>
I use no intercooler of any sort.
I use a custom water/alcohol system I made which totally keeps detonation away and also cools boost charge temps around 100 degrees.

Steve</strong><hr></blockquote>

Dang, Steve -

You impress me a little bit more with each post. <img src="images/icons/wink.gif" border="0"> Seems like a smart move.

Z00

Just as a note, SI for stock internals also looks like SI for stoker intake. Maybe want different abbreviations?

Black LS1 T/A

[quote]Originally posted by Cemo:
<strong>Here's my best numbers for my nitrous boosted FRC:

Quarter Mile = 60'- 2.131, 330'- 5.211, 1/8- 7.727@98.03, 1000'- 9.890> 11.705 @ 124.41 mph
Forced Induction: None
Motor Mods: Stock Internals
Nitrous: N2O 100 Rwhp dry
Transmission: M6
Ring & Pinion Ratio: 3.42
Tires: Stock EMT's
Race Weight: 3355 Lbs.
RWHP & RWTQ @ Sea Level = 439.6 HP and 533.6 TQ
Headers: Stock

Thanks <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" /> </strong><hr></blockquote>

Cemo, why don't you consider starting a list for N2O guys? That should be interesting.

If you have N2O and Forced Induction, you'd make this list... but, N20 alone is not "Boosted", that's the "bottle". <img src="images/icons/smile.gif" border="0">

I bet a LOT of N20 guys make it worthwhile setting up a "Bottled List". <img src="images/icons/wink.gif" border="0"> The are running some quick times out there. <img src="images/icons/smile.gif" border="0">

Cemo

I always considered N20 forced induction but I hear ya. I WISH I had a couple of turbos! <img src="images/icons/wink.gif" border="0">

Black LS1 T/A

[quote]Originally posted by Cemo:
<strong>I always considered N20 forced induction but I hear ya. I WISH I had a couple of turbos! <img src="images/icons/wink.gif" border="0"> </strong><hr></blockquote>

Ha ha! I roger that!

A Twin Turbo setup is plenty macho! <img src="images/icons/grin.gif" border="0">

If they were truly available, there was an even chance I'd have one. I don't know... my ATI SC is big FUN! <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />

SC 98 Mecham

Hey Mike I am running Mac Headers w/Orp. Jason

Cemo

Here's my best numbers for my nitrous boosted FRC:

Quarter Mile = 60'- 2.131, 330'- 5.211, 1/8- 7.727@98.03, 1000'- 9.890> 11.705 @ 124.41 mph
Forced Induction: None
Motor Mods: Stock Internals
Nitrous: N2O 100 Rwhp dry
Transmission: M6
Ring & Pinion Ratio: 3.42
Tires: Stock EMT's
Race Weight: 3355 Lbs.
RWHP & RWTQ @ Sea Level = 439.6 HP and 533.6 TQ
Headers: Stock

Thanks <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />

Black LS1 T/A

[quote]Originally posted by Z00:
<strong>Just as a note, SI for stock internals also looks like SI for stoker intake. Maybe want different abbreviations?</strong><hr></blockquote>

Thanks. <img src="images/icons/smile.gif" border="0"> I'll use St for Stroker.