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Old 10-12-2017, 12:25 AM   #1
maxitoman007
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Default Estimate my build HP and suggest a boost level

Ok so here is my mods list, I'm hoping someone can shed light on how much ho I can expect and how much boost I should run (planning on bypassing the overboost switch).

- Car is 1987 740 Turbo wagon with almost exactly 300 000 km
- upgraded to 13mm rods
- new rod bearings
- new piston rings
- cylinder ridges reamed
- cylinders re-honed using ball hone
- new head gasket
- head resurfaced
- carbon deposits in head cleaned out
- valves re seated
- replaced valve stem seals
- replaced valve hushers
- reshimed head (T cam)
- new front cam seal
- new valve cover seal
- upgraded injectors (brand new browntops)
- new intake manifold gasket
- upgraded intercooler (31x12x3)
- cone filter intake with bottom of intake area cut out or bent down for more air flow
- ebay turbo exhaust header (flange flipped)
- Almost new Garrett T3/T4 60AR intake 63AR exhaust turbo (rebuilt)
- upgraded oil braided steel turbo oil feed line
- new exhaust manifold gasket
- replaced exhaust manifold studs
- t3 to t3 wastegate adapter plate
- Turbonetics external wastegate
- wastegate dump to atmosphere out hood
- 2.5 inch exhaust out hood off turbo
- Greddy E-01 electronic boost controller
- prosport evo wideband
- autometer C2 boost gauge (only goes to 20 psi but EBC screen also had boost gauge)
- over boost switch bypassed
- amm and idle set for new injectors
- new spark plugs (NGK 7es)
- throttle body cleaned with new gasket
- flame trap/ PCV box cleaned
- Greddy catch can
- new oil pan gasket
- synthetic oil (Mobil one)
- 94 octane (with ethanol...) or shell 91
- new coolant
- new power steering fluid
- new coolant temp sensor
- POSSIBLY (Greddy type RS BOV) (heard it creates issues due to blow off of air measured already by the AMM)
- possibly adjusted ignition timing (will have to look into this more)

I think that's it. So what do you guys think I can expect. Anything crucial I forgot to do? Also how will I know when to stop upping the boost? I know I have to stop before I get detonation but I have no clue what that sounds like/how you know you've hit it. Also I know not to run lean (wideband should help with that (is there a number I should be aiming for? Stoich?). I've heard of guys running from 15psi all the way up to like 30 so I just don't know. Any help is appreciated, thanks.
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Old 10-12-2017, 12:34 AM   #2
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Given the questions you’re asking, 160-180whp.
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Old 10-12-2017, 12:35 AM   #3
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137
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Old 10-12-2017, 12:44 AM   #4
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I'm quite new to this hence why I'm asking for help. This is my first build ever and I just want to have a good experience.
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Old 10-12-2017, 12:49 AM   #5
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Quote:
Originally Posted by maxitoman007 View Post
I'm quite new to this hence why I'm asking for help. This is my first build ever and I just want to have a good experience.
Need an exact answer: when you measured top ring side clearance what figure did you get?

EVERYTHING depends on that answer.
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Old 10-12-2017, 12:55 AM   #6
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Can't remember exactly but I remember checking it and know it was within spec.
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Old 10-12-2017, 01:08 AM   #7
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Hopes and dreams + Turbobricks reality check = crushed

Just going by your title we can't guess your hp level with out knowing how much boost you are running. It looks mostly stock ish except the slightly bigger turbo, slightly better intercooler and the ebay header. So 160hp (stock) plus 10hp for every psi of boost over stock. Maybe another 10-20 or so for the turbo/intercooler/header.
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Old 10-12-2017, 01:09 AM   #8
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Totally forgot this was hoodpipe guy.

Can afford to tear a motor down. Can’t afford to hack together a proper exhaust.

Hard to take this thread seriously.
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Old 10-12-2017, 01:21 AM   #9
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Lol haters gonna hate. Just wanted to use the little 2.5" stainless I had.
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Old 10-12-2017, 01:33 AM   #10
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Forget these guys
Looks like a solid 270 with 15lbs of boost

If you turn it up to 17 you should be close to 300
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Old 10-12-2017, 02:53 AM   #11
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Maybe if he switches to a W cam.
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Old 10-12-2017, 10:34 AM   #12
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Hoping to switch to an ipd turbo cam and gear this Christmas/early December so that might help.
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Old 10-12-2017, 10:47 AM   #13
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Maybe if he switches to a W cam.
Technically he has a W cam.....half of the time.
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Old 10-12-2017, 01:56 PM   #14
maxitoman007
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W cam?
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Old 10-12-2017, 02:11 PM   #15
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So...you have a stock stage 0 block with bigger rods, slightly larger injectors, header, IC, and turbo? What engine management?
Stock 7psi I would guess maybe 180.
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Old 10-12-2017, 02:18 PM   #16
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No ECU? That's going to be 0 hp since they car won't even start without an ECU.
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Old 10-12-2017, 02:24 PM   #17
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You'll do better to find one helpful experienced individual to talk to than you will starting threads that just **** on you
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Old 10-12-2017, 02:38 PM   #18
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Turn up boost until you get some steam out the exhaust then dial it back a bit. Then change the head gasket.
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Old 10-12-2017, 05:31 PM   #19
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Quote:
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Turn up boost until you get some steam out the exhaust then dial it back a bit. Then change the head gasket.
the good old "tighten it until it loosens then back off a turn" methodology
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Old 10-12-2017, 06:41 PM   #20
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Before doing any raised boost on your engine. You should run stockish boost and get your fresh engine worn in a bit. Spend the time adding in a wideband to help you monitor it.
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Old 10-12-2017, 06:50 PM   #21
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Meh I don't mind the hate. I guess I'll just set it to stock boost to break the engine in for a bit then turn it up later.
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Old 10-12-2017, 07:33 PM   #22
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I ran a similar setup when I first got my 240, just a +t with an eBay 50 trim turbo and bigger injectors. I don't have any numbers, but at 15psi it ran fairly well, I'd guess ~250hp? Was enough to run consistent mid 14 second quarter miles on street tires. Makes the car not so boring to drive.

As for AFR I would look for 11.5:1 under boost. You'll definitely know if you get detonation. Sounds like shaking an expensive can of marbles.
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Old 10-12-2017, 08:48 PM   #23
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Quote:
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Estimate my build HP and suggest a boost level
148hp/78 psi.













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Old 10-13-2017, 12:32 PM   #24
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T cam? ...210whp & 270lb/ft @ 4500 & 3100 @ 15psi

edit: oh wait .63 housing? peak torque at 3800.

Random guesses
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Old 10-13-2017, 12:59 PM   #25
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Random guesses
That is what this thread is all about.
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