19 replies to this topic

[croquest87]

Hello everyone
I have on 87 conquest  engine runs good  i fixed all the leaks alum radiator  new injectors plugs and clips new valve seals and jet valves eliminated    I re built the turbo w tdo5h 9 blade and small 16 g and ported     88 ecu upgraded  new knock box coil and wires along w plugs rotor and cap timing is set at 10btdc

so here is my question?         if i am getting up on the highway and punch it  car boosts nice and strong to around 10 psi  as soon as i go past 10 psi  engine starts to over speed or something  like the clutch doesnt hold    boost will go up still  but no go untill i drop boost to around 7 to  10 psi   i am re building my extra engine w forged pistons and the works      kinda wanna resolve this issue before my new engine goes in hope soon  any input is apreciated and thank you     i have a manual boost controler and blow off valve on the car w no leaks on any hoses  boost goes up but rpms kinda stay behind after 10 psi 4th and 5th gear only like it overboosts and i dont need that to happen once to many times lol

[Hoosierquest]

Sounds like the clutch is slipping to me.
I would look into either finding a 240mm flywheel or look into the 225mm to 240mm conversion. Pretty sure that is a possibility using the 87 flywheel.

[importwarrior]

Yup clutch seems to be slipping. From what you describe.

A 240 mm flywheel and clutch and you should be good to go.

Might want to check this out. Been a while since this has come out but might be worth a call.

http://www.starquest...showtopic=85751

[croquest87]

thank you guys for your reply  will look into 240 upgrade  before my engine goes in the car     so far have no luck finding new or used 240mm flywheel     I could machine it myself to 20lbs  re grind the surface and have someone o balance it         will go w 15 lb forged stage 2 clutch if i dont find one before motor is in the car  will look what is involved in using 225 flywheel w 240 mm clutch most likely new holes have to be drilled to larger bolt circle to fit the 240 plate    how about the friction surface size on 225  would it be same diameter as 240 flywheel? or needs machined larger?   thank you again for your time and help     sure i will be posting more questions in the near future

[G54Bstore]

Probably a worn out /weak pressure plate. I boost 20 psi on a big turbo and it holds fine on a 225 mm clutch setup.
My clutch isn't anything special.

[croquest87]

Replacement clutch was put in less than 1500 miles on it     i didn't break it in correctly  I think   was probably to rough on it to see what the car can do  lol    after I got it running due to rust in my fuel tank from sitting for a long time     Just got all the parts for my rebuild from engine machine service  what on awesome job Randy did on this motor!           and will lighten the 225 mm and balance w new clutch kit  Any particularly affordable clutch brand that you could recommend?   also i posted on starquest wanted list that i am looking for stock 240 mm would like to machine one of them down some  so far no luck on finding one     and not to crazy about the weight on competition flywheel 15 lbs just sounds to light to me    maybe i am wrong?   wish I could take someones car w comp flywheel for a spin to see what it feels like    before i put bunch of cash in it and not like it

[importwarrior]

https://www.horsepowerfreaks.com


They have a big selection. Check them out.

[croquest87]

Clutch problem solved lightened the stock flywheel to 26.5lbs resurface and balanced   picked up a Kupp stage2 for $120    holds great so far         my engine is built and runs like a champ   I have a nice turbonetics turbo t4 and making adapter flange for it and a bracket for actuator  anyone familiar or runing this turbo?  it is a model  T-23178  also have internal gate set up on it w v band flange adapter for downpipe  it is oil cooled/ lubricated only      my plan is to upgrade to this turbo and gm mass w maft and larger injectors         any input is welcome  and how its done   thank you      
Here is some info on my newly built engine  .020 bored and decked wiseco forged pistons reconditioned stock rods by ems crank checked and polished arp studs new marnal head ported and polished w ss stock size valves and sneider springs arp head studs at 90 Flbs stock size cam    balance shafts are eliminated

[importwarrior]

Nice glad you got it fixed.
I am running a turbonetics also.  
T3
60-1 HIFI
With a 57trim turbine.
Internal gate ported to almost 34 mm
63 A/R
Nice but I think I wan to try a GTX 3067 or GTX3071

[G54Bstore]

NICE

[croquest87]

thank you for your help everyone!     off to figuring out  nice streetable MPI set up  i guess lots of reading and questions again lol    quest for a better performing starquest never ends   like owning adult size rc car

[croquest87]

Hello everyone     After looking into what is involved for mpi conversion  i have decided to go another route   I would like to upgrade to 3" gm mass and maft   wideband along with larger aluminum intercooler and piping    there are couple of good writeups on gm mass and maft but go way back to 2006 and i cant get any pictures   if anyone has some input and a few pictures of your set up or good link to follow would be awesome and maybe gm mass part number    i still want do mpi  some day but cost of all the things needed for it is kinda out of my budget for now     Thank you everyone

[importwarrior]

The better solution is to get a scott87star megasquirt and run the stock setup.
Much better tuning and stability of the tune. He can make it work with the stock
Ecu harness with little modification.

http://www.starquest...6

[croquest87]

Thank you  importwarrior  you are a big help    that looks like a very good option to me and will contact him soon     good thing i asked cause didnt even know something like that was available        will keep you all posted when its all up and running

[croquest87]

Well l ended up going the extra mile and bought me moded magna mpi from one of the members here  Talk to Scott about the ecu to run it will be ordering from him soon  time to make or buy td05h to t3/t4 flange and v band 2.5 downpipe as l will be using internal waste gate   and do some intercooler plumbing for the mpi

[croquest87]

If anyone has a link or pics to how you set up your fuel pressure regulator on magna mpi  my top is caped for the stock regulator w fittings on each end of fuel rail much apreciated thank you tv

[croquest87]

Tv is a typo lol

[croquest87]

Finally found nice 240 mm stock flywheel will lighten up some and bigger clutch  can't wait to install it

[psu_Crash]

Not sure I understand your fuel pressure regulator question. most any aftermarket FPR will do the trick. Just make sure you get one that is boost compensating. Generally a 1:1 ratio is what you are looking for, although I know a few guys run a non-linear unit. Just run a line off the magna to the FPR, Then plumb the outlet of the FPR to the stock return line. Vacuum line to a dedicated port on the magna. Done

[importwarrior]

As far as turbo a good option for daily street is the
TD06 18G
TD06 20G

Don't go td05 or 05h.
The 06 is perfect for our cars.

Even the 06SL2 is good for our engine.