[BroxLotus]

Delayed response, but this is the most recent dyno graph. Shortly after the dyno tune I found out that I had a faulty wide band sensor. Unfortunately since winter is fast-approaching here in MN there won't be a re-tune until next season.

I may be looking at changing the turbine housing and modifying an exhaust housing like you've done.

 

[thangcu35]

Delayed response, but this is the most recent dyno graph. Shortly after the dyno tune I found out that I had a faulty wide band sensor. Unfortunately since winter is fast-approaching here in MN there won't be a re-tune until next season.

I may be looking at changing the turbine housing and modifying an exhaust housing like you've done.

I'll upload the dyno for you. Looks like Cams crossover is around 5500rpm? Is the shop comfortable tuning 2zz engines? Reason I'm asking is a lot of places don't know how to tune VVT. They set Lift similar to vtec, but you need VVT tuned for best spool up and mid range power.

 

[thangcu35]

I was unsure when BOE would resume selling their tunes, and I would hate for the car to sit until then so I opted to go with ID725cc injectors instead of ID1000cc. 725cc injectors are more manageable and still be able to support my goal of 350-400whp. I had a hunch that I can get the car to run safely on stock ECU with E85, since E85 is very forgiving when it comes to knock/detonation. By fiddling with the fuel pressure regulator I was able to get the car to idle, cruise, and WOT with the stock ECU/E85 combo. I used an app on my phone to check short term fuel trims and more importantly ignition timing under WOT. To my surprise the NA ecu throws out conservative numbers compared to turbo 2zz's that I've tuned in the past. I think it's even safe to run on pump gas, but I'll stick to E85 until I can strap it on a dyno with a tuning software.

Turbo is very responsive, I'd estimate full boost to be around 3500rpm in 4th gear. I have no boost gauge, but I'm using a 7.5 lbs wastegate springs so it's around there. Here's a short clip, it caught me a little off guard since I didn't expect to roast tires in 2nd gear when it's hot out.

These are the last few pictures that I will post for a while. Will be on vacation and won't update for a couple of weeks. I still have a couple of minor gremlins to track down when I get back and hopefully get started with boost control.

 

[275 Turbo]

Nice work bro! Love the "dumppipe" off the wastegate haha no wonder she screams

 

[Giantmcm]

Nice progress Thang...I sent you a PM with a question for you.

 

[Reach]

What air to water unit are you using? That might come in handy for me as well.

 

[white out]

In for updates.

 

[thangcu35]

What air to water unit are you using? That might come in handy for me as well.

It is frozenboost's type 19 water to air IC.

 

[ruggedbert]

Hows the project going?

 

[thangcu35]

Hows the project going?

The car is running great, still on stock ECU and 9-10 psi of boost. I already put over 3000 miles on the turbo setup and no issue so far. At this point, I'm waiting for Eliseparts to ship me a modified EP standalone ECU to work with drive by cable so I can finally tune the car. I'll post dyno result once the ECU is in.

 

[thangcu35]

Finally an update. OEM ECU did very well running the turbo setup with 725cc injectors with some minor tweak to fuel pressure. I recently passed OBDII emission with flying color. Spring is approaching and it's time to put away the stock ECU to see what this stock engine can do on full standalone E85.

The ECU I'm working with is EP Tuning ECU from eliseparts. Originally, this ECU was made for an Exige DBW. Eliseparts sold me an adapter harness to make it work with 05 cable Elises. One good thing about this ECU is that the connection to laptop is made via the OBDII port. So no messy wiring through the rear firewall. The bad thing is, I had to make custom brackets to mount the ECU to the firewall, since there is now an additional adapter harness box.

This standalone is capable of running on MAF or MAP sensor. For my case, I converted to a GM 3bar MAP sensor for ease of tuning boost. After a couple of days tinkering on the software, I finally made a base map with good cold start, idle, cruising, and full throttle. I used VVT and ignition timing maps from my old 2zz turbo builds to adapt it to the new base maps. I'll be tuning on a dynojet in the near future to make the 350whp as intended. The car will be complete with boost by gear, traction control, and some nice rubber in the rear.

 

[glagola1]

It's good that you're getting new rubber in the rear. What are those bristle blocks you were running? Yikes!

It's pretty interesting that the stock computer was running the car with only adjusted fuel pressures.

 

[Reach]

Looking good my man! We'll have to arrange a meet this spring, maybe at the Fayetteville dragway

 

[thangcu35]

Looking good my man! We'll have to arrange a meet this spring, maybe at the Fayetteville dragway

Oh yes! Can't wait to see your k20 beast.

 

[Giantmcm]

Nice Work Thang...most impressive in terms of your work/tuning skills.

I have finally started my car's project...and so I am just taking my time on it right now, as my family needs its attention after being in wrestling season the last few months. Hoping to have the body work finished up in the next few weeks.

 

[PLAY-DOH]

Nicely done

 

[djgaloot]

You do really nice work. I am planning on boosting my 2005 Elise in the future and was all set on supercharging until seeing your posts. Super clean install. I was looking more at the 275-300 range max to keep the drivetrain intact for a longer period of time. Would you comment on the responsiveness of your turbo installs in day-to-day spirited driving compared to a supercharger like the BOE Rev300 or Rev400? similar? 75-100mph, 0-30? etc. Looking forward to future installments, spring is nearly here.

 

[thangcu35]

You do really nice work. I am planning on boosting my 2005 Elise in the future and was all set on supercharging until seeing your posts. Super clean install. I was looking more at the 275-300 range max to keep the drivetrain intact for a longer period of time. Would you comment on the responsiveness of your turbo installs in day-to-day spirited driving compared to a supercharger like the BOE Rev300 or Rev400? similar? 75-100mph, 0-30? etc. Looking forward to future installments, spring is nearly here.

It doesn't matter how small a turbo, it will have some "lag" or throttle response in comparison to the supercharger. Supercharger setups generally are more reliable and consistent, where as turbos have more components to go wrong. So if you are not mechanically inclined and like to never touch the engine, supercharger is the way to go. Turbos on the other hand have the capability of increasing power with just a boost controller. It has more flexibility in power delivery and can make more mid to top end torque than a supercharger. However you need a competent tuner to bring out the best of the turbo, otherwise it's a lose lose situation when compared to a TVS or Twinscrew, on street and on track. I would say the turbo accelerates faster than a supercharger given the same peak power output, but that's only in a straight line. I went with a turbo mostly because of personal taste. I enjoy hearing the blow off valve, the cool spool up and from lag to insane acceleration. A well installed turbo setup makes a very fun day to day street car.

 

[djgaloot]

Thanks for the summary, it was very helpful and gives me areas to think about. Keep us posted on your pursuits!

 

[thangcu35]

Well, here it is. Dyno tuned and ponies delivered as promised.