Rob Roy

I'm not a technical expert on forced induction, so excuse my ignorance, but if you are running the same amount of boost on a turbo as a s/c, surely there should be no difference in the issues that the motor should face re compression and detonation etc? That being said, with Murf/928 Motorsports, & 928 Specialists s/c kits out there running on late model S4s with few problems if any, being reported (as of yet), why would it be any different from Mark's kit?

MarkRobinson

HyBred: my engine spools faster with the .84 AR (Garrett) & appears to be happier on the top-end. .68 is a bit of a choke as that's the size of choice for the 3.0 Supra's @ Boostlogic.

I use a partially-tested efficient air/air IC: I don't like the idea of instructing people on how to modify a 20-year old plastic bottle to hold hot liquids. Yes, A/W IC's work, I just don't like the 928 arragements & lack of space. My personal opinion.

Mark

MarkRobinson

Hi Guys, Though I do appreciate comments & such, esp. from those who have prior experience, I must be forward & say that I really dont have the time to explain every question about my kit.

This is why most of my answers on things are curt. I'm juggling a 60hr work week, my turbo kits, my new house & moving in, my wire sales, my vacuum line kits (one-time thing thankfully), my gym-time & health (herniated disc in my back), + my Architectural exams. Over the next few months, my time on this list will probably grow shorter as well. I do plan to bring on some outsourcing "help" on my kits, as my job developing them & getting them to market is almost complete.

So far, I've ready all comments & suggestions on my kit & have tried to respond to most all of them, esp. when I feel someone has what I feel to be an inaccurate opinion or a contrary experience.

I've had turbocharged Porsches for 10 year plus, racing them as well. My friends & colleagues are the best in the world at turbocharging, as you can easily investigate: www.boostlogics.com, www.tuning-concepts.com, www.performance-motorsports.com.

Tammons has great experience as well & his suggestions are noted with a happy face. Just to clarify: my kits are designed for stock engines at low boost levels designed for every-day driven 928's on pump gas: hence the low boost. Boost can easily be turned up & the turbocharger I've selected & tested in a few variations is a great compromise for street/track. I'm trying to keep spool up, compressor efficiency, and overall HP/TQ as high as I can so that I dont get people spooling too fast & running out of compressor, or spooling too late & only being efficient once they're over 550hp. The T61 is a relatively small turbocharger, with great longevity, & fast spool (5.0's pushing it).

Like I'm doing for Abby, I'll happily accommodate anyone who wants to push the envelope, but did not design the kit for envelope-pushers specifically, as I'm a firm believer in 3 rules of performance: walk before you run (low boost & tune before more boost), keep your power goals realistic to our checkbook (as nobody can be/remain "top dog" in the HP wars forever), and start with a good platform for your performance needs (meaning, don't take a Honda & try to make it outrun a GT2: save for the GT2 or start with a stronger platform than a Honda's).

Have a great weekend, I gotta get back to work.

tammons

Sounds great and good luck.

Personally I have gone from a HP freak to a mileage nerd and am now driving a TDi jetta for a while.

Its a nice car, but I do miss the power.

lorenolson888

Hi Mark...

and

Tammons...

The kit is beautiful... very elegant and a great solution to heat and space considerations...

I like the idea of compression ratio being dropped for those who have the money and are planning an engine build...

Mark is the turbo sized (smallish) for those who want to run stock internals...

also you mentioned a chip for 85-86 LH 2.2 cars... so is this available...

The stock EZF (I heard it is different than EZK) ingition unit has a vacuum sensor... does the sensor have linearity up to positive pressures... like +1bar... if so I have been looking at the code with a eprom programmer... or would runnig a piggy back make more sense...

I know it is listed somewhere...

how much for the stock kit... no IC...

LO

tammons

IMO if you want to run 6-8psi you could do it with a custom chip, bigger injectors, spark retard on boost, and a rising rate fuel regulator. Those items are a pretty simple upgrade and if the Rising rate FP reg is set up correctly it should be safe. The key to running safe IMO is knowing what the exhaust temps are.

First thing I would put on a custom turbo car of any sort is an exhaust temp guage. Its a great tool.

The guys here at Essa tech that build some extreme turbo cars dont even use O2 sensors at all, due to race fuel and tune their cars 100% by exhaust temperature and use TECs.

Joes Essa's personal car was a 1200 hp corvette and the last car I saw in his shop was a 2000hp 1970 chevelle. Marco that worked there drove a 750 hp 911 as a daily driver.

MarkRobinson

Hi Loren,

The turbo is sized for a stock motor. You can upgrade the turbo (inexpensively) if you have a built one (like) abby, but the turbo will work great on either. For over 6psi (as per Tammons), I have a Stage 3 kit that adds an SMT-6 to program in timing retard while on-boost via an external MAP sensor programmed into SMT-6. The BEGI regulator is the best on the market for trimming up/down & on-boost fuel pressure spiking ratios for your fuel curve, and the SMT-6 is also a gem at perfecting your fuel maps as well. The BEGI regulator & fuel line upgrade + new 30# injectors + 2-heat ranges colder spark plugs are all included in the base kit ($4995). The SMT-6 adds $500 with the custom maps.

EGT monitoring is a tried & true method as well. Since my pro-tuning buddies prefer the widebands, I opted to choose this route as well as they like to oversee my progress & make suggestions here/there. EGT monitoring is fantastic as well for on-boost tuning, but doesn't allow the off-boost monitoring that the wideband does, to ensure things are "normal" in closed-loop & start-up.

tammons

True and wide band is almost instant response. The reason Essa tech used EGT was because of race gas.

Fabio421

What exactly is an SMT-6?

zoltan944

its perfect powers piggy back.
http://www.perfectpower.com/products/smt6.asp
takes signals from your car (stock ones, plus the ones for the piggy back) and sends your computer didffernt outputs to do what you want. Its like overriding your stock fuel map, with a new one.