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Quest 4 MPI


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#121 randy

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Posted 03 March 2014 - 08:38 AM

Waiting to see the finished product. What is the benefit of running dual waste gates?





#122 RonnieJ

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Posted 03 March 2014 - 09:39 AM

Hes running a Twin Scroll or Divided setup. You dived and pair companion cylinders so you have no interference and optimize spool time. Ive seen 500-800 rpm faster response time on a twin scroll setup.

Some good info here

https://www.turbobyg...ength_manifolds

Turbo By Garrett said:

A design feature that can be common to both manifold types is a "DIVIDED MANIFOLD" , typically employed with " DIVIDED " or "twin-scroll" turbine housings. Divided exhaust manifolds can be incorporated into either a cast or welded tubular manifolds (see Figure 5. and Figure 6.).
The concept is to DIVIDE or separate the cylinders whose cycles interfere with one another to best utilize the engine's exhaust pulse energy.
For example, on a four-cylinder engine with firing order 1-3-4-2, cylinder #1 is ending its expansion stroke and opening its exhaust valve while cylinder #2 still has its exhaust valve open (cylinder #2 is in its overlap period). In an undivided exhaust manifold, this pressure pulse from cylinder #1's exhaust blowdown event is much more likely to contaminate cylinder #2 with high pressure exhaust gas. Not only does this hurt cylinder #2's ability to breathe properly, but this pulse energy would have been better utilized in the turbine.
The proper grouping for this engine is to keep complementary cylinders grouped together-- #1 and #4 are complementary; as are cylinders #2 and #3. Because of the better utilization of the exhaust pulse energy, the turbine's performance is improved and boost increases more quickly


#123 randy

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Posted 03 March 2014 - 10:44 AM

Thanks a lot Ronnie J gonna read that info.

#124 natedog_37

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Posted 04 March 2014 - 01:21 PM

Great read.  Can't wait to see this can move.
Nathan
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#125 jabbott126

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Posted 01 April 2014 - 03:50 PM

Yeh me either Im finally getting to work on it this weekend!!!! hopefully should be going not to far from now

#126 RonnieJ

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Posted 07 April 2014 - 01:05 PM

Get a chance to work on it this weekend?

#127 jabbott126

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Posted 22 July 2014 - 11:43 AM

Well I've finally tracked down the issue of coolant oil mixture.  So reassembly is in progress decided to fix up a couple of other things in the meanwhile.

#128 jonboyb

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Posted 22 July 2014 - 01:56 PM

Was the coolant mixing tied to your waterpump/timing cover or elsewhere?
87 Valencia Quest - MPI MSII
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#129 RonnieJ

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Posted 24 July 2014 - 12:24 AM

Yes what was the cause?

#130 jabbott126

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Posted 27 July 2014 - 04:45 PM

Yeh it was the timing cover to the best of my knowledge we will find out on next start up I suppose.

#131 jabbott126

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Posted 30 July 2014 - 08:57 AM

Parts are on the way.  Working on redoing the coolant pipe on the Intake atm. Just gotta weld on some bungs for iat  and coolant temp. Re center the ignition wheel and reinstall everything.  I'm getting close again!

#132 jabbott126

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Posted 30 July 2014 - 11:12 PM

.

Edited by jabbott126, 30 July 2014 - 11:15 PM.


#133 starquestJOE

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Posted 14 February 2015 - 06:19 AM

Any
Updates ?

IM STARQUEST 4 LIFE ....
88 tsi-80k one owner bone stock R88 unicorn
87 tsi - red - sometimes mine sometimes ryans
89 tsi-46k-red but not for long!!!
88 esi-r-white-SOLD
88 tsi white 61k-SOLD
89 tsi-black-rip
87 tsi-black/red-SOLD
88 tsi yellow sold
89 tsi white parts car
88 esi-r-black-RIP
87 tsi-somewhere in MD....need to pick it up
                    88and 89parts car...need parts???
          lookin for  RHD starion and part to convert to RHD
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#134 jabbott126

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Posted 13 March 2015 - 11:11 AM

Yeh its warming up again I have all the parts needed to finish her up now i just gotta clean the garage and get started. Shouldnt be long. I sent alot of time working on perfecting some of the areas that i rushed on. But ive been waiting for winter to pass so that when i do get her started i can break in the motor.

#135 jabbott126

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Posted 19 June 2015 - 11:52 PM

progress has been made. Reassembling things now. Hopefully we will hear the beast roar soon enough

#136 jabbott126

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Posted 19 April 2018 - 10:24 AM

Trying hard to find the modivation to finish this thing. Not to far off from finishing now.

About time to hear this thing run! It's been sitting around since 2012...

#137 importwarrior

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Posted 19 April 2018 - 07:06 PM

Wow 2012.
Get her done enjoy the rewards of your hard work.

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#138 jabbott126

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Posted 11 July 2018 - 08:17 AM

View Postimportwarrior, on 19 April 2018 - 07:06 PM, said:

Wow 2012.
Get her done enjoy the rewards of your hard work.

You mean these cars actually do things other than just look pretty in a garage for 6 years?

#139 importwarrior

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Posted 11 July 2018 - 12:40 PM

LOL depends on your car I guess. mine runs but clear coat is peeling like the geico money guy riding down the street...

B-71 87 TSI ~ RIP

Black 87 Starion ~ Mess SOLD!!!

Proud New 89 slightly Rusted Fiji Owner !!!







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