Back in the aftermost episode, we acquired 50 rwhp by swapping to high-flow ported active (Jose Motor Sports) and a hydraulic roller cam (Comp Cams). Our ability assets were absolutely absorbing because there was almost a 3 psi accident of boost. Apparently the 58mm Precision turbo we installed in Part 3 was a abundant advancement for the banal cam and active at the time, but could not abutment abundant air aggregate for the latest higher-airflow combination. This accepted it all-important for a move up to a beyond turbo in adjustment to restore addition and acquisition out what the absolute assets would be at the aforementioned addition (20 psi). We alleged the tech band at Precision Turbo with the specs of our new aggregate and explained the addition loss. They recommended we use the new 6262B (62mm) assemblage that would restore addition and alike accord us the advantage to crank it up further. To advance a stock-like underhood appearance, we ordered a banal intercooler with a fatter Duttweiler neck-end from G Body Parts. These two t-ons would accompany aback addition while affective added air rapidly to aggregation up with the high-flow active and roller cam from Part 6.
During the winter GN buyer Tim Cairone begin a bounded accord on an ‘87 3.8L short-block. He couldn’t canyon it up. It was a complete counterbalanced accumulation with artificial JE pistons and H-beam Eagle rods. Downtime during the algid winter months was a absolute time at Tim’s boutique (Shore Wheels, Tuckerton, NJ) to bandy out the short-blocks. Sure, the balanced, lighter/stronger, rotating/reciprocating genitalia will add a few application to our analysis results, but will additionally be added abiding for approaching dyno and clue duties. Once the V-6 was active with the new 62mm Precision turbo and Duttweiler necked, banal intercooler, it was broken-in for almost 300 afar with 18 psi boost.
Once afresh we visited our accompany at Tune Time Performance for dyno testing and to tune for a safe AFR (air/fuel admixture ratio) afore axis up the boost. Our associate Matt Hauffe (Tune Time’s buyer and affability expert) would be at the caster of Tim’s GN administration dyno duties. On the aboriginal cull we were admiring to acquisition assets in ability (19 hp, 24 lb-ft) at 18 psi addition (lowest addition from 62mm turbo) compared to the abate 58mm turbo (17.5 psi, best addition from 58mm turbo). By afterward Precision’s recommendations we benefited with the appropriate admeasurement turbo to bout the airflow aggregate bare for our combo. Follow forth the captions and analysis the archive and graphs to see the big-time assets accomplished by allocation out a able-bodied akin combination. In our aing adventure we’ll be aback to track-test Tim’s able artery cruiser.
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